A Brief about Pressure Relief Valves

What is Pressure Relief Valves?

A Pressure Relief Valve (PRV) or relief valve is a type of safety valve that is used to control the pressure in a system that might otherwise disturb the process and consequently lead to system failures. It is designed to open at a pre-determined pressure level to protect other equipment from being damaged due to excess pressure. It aims at protecting property, life and environment.

Image Source - Wikipedia

What is the function of Pressure Relief Valves?

Normally, the pressure relief valve remains closed until pressure raises to the desired set pressure. When this level crosses, the valve opens and continues to further open and diverts the excess gas/ liquid to pass away. The valve closes again when the upstream pressure falls below the set pressure.

What are the Importance of Pressure Relief Valves?

Heavy gas equipment or industrial machineries that require gases at a certain set pressure level for proper mechanism can sometimes misbehave and if proper safety precautions are not observed may cause heavy loss to life and property. The most common causes of over-pressure are blocked discharge, thermal expansion, chemical reaction, cooling system failure, heat exchanger tube rupture, etc. These indents can happen suddenly at a much unexpected hour and may also take place simultaneously. Therefore installing the correct pressure relief valve is of utmost necessity. It is your responsibility to determine a scenario for the appropriate selection of the relief valve.

Schematic diagram of a conventional spring-loaded pressure relief valve. Image source - Wikipedia

How to Select the Correct Pressure Relief Valve?

Mainly, there are two types of safety valves – Pilot operated safety valves & Spring loaded safety valves.

Pilot Operated Safety Valve

The pilot valve actuates at the set pressure and prevents medium from being routed to the vented dome. Due to the vents in the dome, closing force does not become a condition for system overpressure to push the main valve open and results in the opening of the main valve. The opening is either gradual and partial or rapid and complete. In case of drop in the system pressure, the pilot valve actuates and re-routs the medium to the dome, repeating its procedure.

Spring Loaded Pressure Relief Valve

In this types of valves, an increase in pressure results in increase in the spring force. The system pressure must raise enough to lift the valve. For this reason, most pressure relief valves are equipped with a secondary control chamber to enhance the lift by allowing fluid to enter the chamber that exposes a larger area of the disc to system pressure.

This causes an incremental force change that causes the valve to open at a rapid rate. Simultaneously, the direction of the fluid flow is reversed and the momentum thus created further enhances the lift. Due to this setting, the valve remains open until the pressure reduces to a level below the set pressure.

CO2 Regulators & Cylinders for Aquariums

8 Tips to Remember Before Using CO2 Regulators & Cylinders for Aquariums

CO2 cylinders and regulators are primary components of kegerators, aquariums and are commonly used in many applications. However, when working with CO2 cylinders and regulators, here are some tips you must know to be safe during the operation.

1. When it is time to refill, do not simply remove the CO2 regulator. Relieve all the working pressure from the low pressure gauge to prevent further damage to the gauge during re-installation of the regulator.
2. After re-filling your CO2 cylinder, vent it for 1 or 2 seconds before installing any components to the cylinder. This helps remove any debris that may have wedged in the cylinder valve. Preventing debris from entering also prolongs the life of your CO2 equipment.
3. Make sure the cylinder reaches room temperature before re-installing the Co2 regulator. This ensures equalization of the pressure in the cylinder and enables it to take accurate pressure readings.
4. Put your seal between the regulator and the cylinder valve. Remember to hand-tighten the seal if you are using a permaseal as a wrench is usually not required.
5. When all is done and you are installing the regulator, ensure a tight connection using a crescent wrench or CO2 wrench so that there is no loss of CO2.
6. Remember not to over-tighten the bubble counter on your CO2 regulator as this may cause the bubble counter to break off or damage the components that prevent contamination of your regulator.
7. Always use a check valve in the CO2 tubing to protect your CO2 equipment as it prevents water from spilling out of the aquarium through the tubing towards the regulator.
8. If you face a problem with your CO2 regulator, do not attempt to diagnose or repair on your own without prior consultation of our experts.

Evergreen Midwest Co. has trained professionals and industry experts to give you proper advice for all your regulators and valves. You can contact us at 800.659.3358. We also have a wide selection of industrial regulators, valves and valve accessories that are tested for performance as per the latest international standards.

Cryogenic Regulators - Understanding Cryogenics and Associated Hazards

Cryogenic liquids are formed when gasses are converted into liquid form. They are liquefied gases that have a boiling point of -150°C (-238°F). As there is a substantial difference between the gas and surrounding environment, it requires a special equipment to contain these liquids. Typically, the arrangement consists of a pressure control system, a storage tank, piping required for fill, supply, one or more vaporizers, and vaporization.

Characteristics of Cryogenic Containers

The tank looks like a vacuum bottle that is manufactured to keep heat away from the liquid. The cryogenic liquid cylinders are vacuum jacketed pressure vessels that are insulated too for obvious reasons. Vaporization of the liquids is a continuous process due to heat leak of the containers. However, the rates of vaporization depend upon the volume of the stored product or design of the container. The containers holding these liquids are manufactured in accordance to the latest industry standards and comply with all the industrial cylinder regulations. They are fitted with insulated rigid or flexible lines that are used to remove the liquid from the containers and hence minimize the loss of the liquid product to gas. The cylinders are designed to dispense gases like Argon with standard CGA (Compressed Gas Association) outlets along with suitable cryogenic regulators. The cylinders have capacities between 80 and 450 liters of liquid and operate at pressures up to 350 psig.

Handling & Storage of Cryogenic Containers

The cylinders must be stored in a confined space where adequate ventilation is available. They should also be equipped with cryogenic regulators that control internal pressure build-up. Users must take care not to tamper with, remove, or plug any pressure relief device without proper monitoring. No unprotected body part must be exposed to un-insulated pipes or equipment containing these critical-natured products as the extremely cold metal causes the flesh to stick fast and tear when attempting to withdraw from it. Instead, experts suggest using a hand truck for moving these containers. The containers should always be held and stored in an upright position and must not be dropped or rolled on their sides. 

DO NOT USE ADAPTERS – as mentioned in the container’s caution instructions. Always use proper connection. Industry professionals suggest using a check valve or some protective apparatus on gas withdrawal systems to prevent reverse flow of the liquid. The piping must always be equipped with pressure relief devices to prevent the cryogenic liquids or cold gases from getting trapped in piping between valves.

Evergreen Midwest has been serving the industry with its industry-compliant valves and regulators since 1978 and adheres to the highest quality standards while delivering products to customers. For any of your industrial equipment requirements, especially gas regulators and valves, please feel free to contact us by phone at 1800.659.3358 or visit our website at https://www.evergreenmidwest.com/ to get an insight of all the products we provide.

Source - https://www.evergreenmidwest.com/blog/2017/07/03/understanding-cryogenics-and-the-associated-hazards/

Chlorine Valves - What Risks are Chlorine Valves Exposed to?

Chlorine valves are exposed to various risks referring to the chemical properties of the liquid: 

Hydroscopic: In case the water content in dry chlorine is more than 50 parts per million, ferric chlorides (CL3F3) and hydrochloric acid (HCL) are formed. The HCL is highly corrosive and has the potential to damage the piping system that are made from carbon steel while the CL3F3 can create problems for seating surfaces of Teflon.

Also, the liquid is classified as a TIH – Toxic by Inhalation and this property clearly indicates the critical nature of the substance and the job of the valves to keep the liquid inside without any leaks from bonnet joints, packing, and castings.

Inflammability: Chlorine, by itself is neither flammable nor explosive. However, it may support combustion under specific conditions. Gas, as well as liquid chlorine, tend to react explosively with hydrocarbon-based lubricants. The valves must be prepared and properly cleaned for servicing the substance packed within. In addition, proper care must be taken while packaging and transporting these cylinders.

Dual Phase Flow: These are known to cause cavitation and flashing which is problematic for valves because of the energy that is generated inside the valve could potentially damage stems and trim.

Oil and Grease: Chlorine sometimes can react explosively with organic materials including oil and grease that comes from pumps, valves, air compressors, pipe thread lubricants, or oil-diaphragm instrumentation.

Hydrogen: Chlorine if mixed with hydrogen can become potentially explosive within a specific range of concentration levels. If the cylinder is placed along with hydrogen containing cylinders, valves play an important part in securing the liquid/gas within and preventing hazardous situations.

Temperature: The volume of chlorine increases with increasing temperature. To avoid this volumetric expansion, there should be precautions that are taken to keep the temperature at a consistent and appropriate temperature.

Auto-refrigeration: When chlorine is released, it tends to escape rapidly. However, the pressure in the cylinder attempts to equalize with that of the outer atmosphere.

Valves are subjected to critical conditions which demand extra carefulness and safety standards. These chlorine valves must be bought from a reliable industrial valve dealer like Evergreen Midwest, who has been serving high quality and durable valves and regulators to the industry since 1978. Evergreen Midwest has a wide range of valves that are essentially required for critical operations. Please visit: www.evergreenmidwest.com or call 800.659.3358 to know more details. We look forward to hearing from you soon!

Source - https://www.evergreenmidwest.com/blog/2017/07/11/what-risks-are-chlorine-valves-exposed-to/

Valve Uses - The Dos and Do Nots of Valve Use

 Do:

Proper care of compressed gas cylinder valves includes (but is not limited to) the following:

• Store valves packaged so cleanliness is maintained and adequate protection against damage is provided.
• Visually inspect all valves for leakage and damage at every refill.
• Reach out to your supplier if the valve is malfunctioning and the problem cannot be diagnosed.
• Inspect PRD before installing and refilling.
• Verify the valve is suitable for both the cylinder and its intended use.
• Open valve slowly to prevent development of high pressure surges and heat generation on down-stream equipment.
• Only use original manufacturers parts and assemblies when replacing PRD (unless the interchange of parts is proven by manufacturer testing).
• Double check all markings when replacing a PRD, ensure only the proper device is installed.
• Ensure when the cylinder is not in use, even if empty, the valve is in the closed position with the outlet cap in place and transport cap installed.
• Verify the outlet and inlet threads, especially the first thread, are not damaged on the valve before installing into a cylinder. A damaged first inlet thread could adversely affect insertion. If damage cannot be repaired by manually deburring with a file, replace the valve.
• Carefully handle valves to avoid damage, especially to the threads.
• Only specially developed lubricants prepared for oxygen service should be used on tapered threaded inlet connections.

                                                           DO NOT:
This list is not intended to be comprehensive – review maintenance activity with the valve supplier before beginning work if there is any uncertainty on the part of the user.Proper care of compressed gas cylinder valves includes (but is not limited to) the following:

• Do not use a damaged valve where the function or integrity might be affected.
• Do not continue to use an abnormally functioning (becoming noisy or progressively harder to operate) valve.
• Do not try to recondition a valve until the design and operations of the valve are completely understood and proper tools are available.
• Do not reuse a valve having a tapered inlet thread with less than four (4) full threads showing after it is installed into the cylinder hand-tight.
• Do not use an automated operator, wrench, adapter, or other tool to obtain a greater mechanical advantage on hand-wheel operated valves without first consulting with the valve manufacturer to ensure applied torque does not exceed safe operating torque for the valve.
• Do not lubricate valves internal surfaces with the pressure boundary without first consulting with the valve manufacturer.
• Do not lubricate oxygen service valve threads (to cylinder threads) for installation in straight-threaded aluminum.
• Do not attempt to adjust spring-loaded PRDs, as they are not adjustable once set at the factory. Adjustments could lead to damage to the PRD and to the valve.
• Do not lift, drag, or move cylinder using the valve handwheel as a handle.
• Do not put a reconditioned valve into service until it has been fully tested to this standard.
• Do not use internal operating replacement parts unless they were supplied by the valve manufacturer.

Source - https://www.evergreenmidwest.com/blog/2018/03/26/valve-uses-the-dos-and-do-nots-of-valve-use/

Understanding Irrigation Master Valves and Their Wirings

Master valves are essential equipment when considering the installation of an irrigation system. It is an electric valve that completely controls the water flow from the supply point. The valve helps reduce water leakage from a leaky station valve as it supplies pressure to it. As the name suggests, it masters the water supply in case your irrigation main line damages. 

A master electric valve is similar to your station valves, but instead of being installed in the downstream from the main line, it is installed at the front of the line in the upstream and is connected to the master pump in the controller.

Let us now understand the master/pump valves wiring:

Usually the timers in the sprinkler systems supply power to a relay so that it could send power to the sprinkler pump. The sprinkler systems use secondary water and are supplied water at very low temperatures.

Master valves are essential equipment when considering the installation of an irrigation system. It is an electric valve that completely controls the water flow from the supply point. The valve helps reduce water leakage from a leaky station valve as it supplies pressure to it. As the name suggests, it masters the water supply in case your irrigation main line damages. A master electric valve is similar to your station valves, but instead of being installed in the downstream from the main line, it is installed at the front of the line in the upstream and is connected to the master pump in the controller.

Let us now understand the master/pump valves wiring:

Usually the timers in the sprinkler systems supply power to a relay so that it could send power to the sprinkler pump. The sprinkler systems use secondary water and are supplied water at very low temperatures.

• The circuit is connected with the wires from the relay – one wire to the common terminal and one to the valve terminal. The relay gets power when the timer activates it.
• On receiving power, the relay closes contacts and power goes to the pump to activate it. The selector on the pump allows using 110 volts, otherwise it is pre-wired for 230 volts.
• At the same time when the controller/timer sends power to the sprinkler pump, it also sends power to the sprinkler master valve and opens it. So, when the pump creates pressure in the system, this opens the sprinkler zone and waits for water.

This is the complete cycle. On completion of this cycle, power to the sprinkler valves is shut off by the timer/controller. At the same time, it shuts off the power that is supplied to the relay and the pump. Although it varies from timer to timer, most of the pump valve circuits are by default on the sprinkler controller/ timer.

Its configuration is technically simple. However, users no longer have to select the zone to which the valve is connected to, as now the option will completely depend on the controller selected when you set up the controller for the first time. Evergreen Midwest is an online store that stocks all types of industrial valves and regulators and has been serving the industry since 1973. To place an order for master valves, please call us at 1800.659.3358 or visit our website at https://www.evergreenmidwest.com/master-valves.html

Source - https://www.evergreenmidwest.com/blog/2017/07/18/understanding-irrigation-master-valves-and-their-wirings/

Check Valves - Things All You Should Know

Check valves are a kind of valves that serve multiple purposes and are an essential valve required in almost all the industries. Practically, there is no industry where these are not installed on the operating systems. Valves in general are a critical component of any machinery and therefore must be selected after proper research for quality, durability, and sustainability. Your decision will greatly impact the functioning of machineries and the ultimate outcome of the project the valves are used for.

Construction of a Check Valve

The basic construction consists of a bonnet, valve body, and a disk that is attached to a hinge and moves away from the valve seat to allow the fluid to flow forward and returns when the upstream flow is stopped and thereby preventing reverse flow. The folding disc valves have a disk that consists of two halves that are attached in the middle and fold backwards once the upstream flow is initiated. When the upstream flow stops, these two halves spontaneously close the flow path. In lift-check valves, the disk comes in the form of a piston which is moved out of the path during upstream flow and returns by gravity to stop the flow. In case of ball valves, the disc is in the form of a ball.

Applications of Check Valves/ One-Directional Valves

These valves are generally installed in operations in which there are chances of total or partial shut-down of a compressor or pumps due to backflow of gases or liquids. So, these types of valves are most commonly found in gas systems and certain other applications where liquid flow has to be controlled.

This list is a necessary go-through before placing an order as it gives a complete insight of the utilities these valves can be put to:

• Be careful while selecting the size as properly sized valves contributes to longer life of the valves, pumps, as well as other related components.

• While an oversized valve could cause an early wear or failure of certain essential components, an undersized valve results in high loss in pressure, excessive noise, and even vibration.

• They are essential for smooth operation of fluid pumping systems.

• They can efficiently reduce Water Hammer condition that can badly damage pipes, Water hammer is caused due to pressure surge because of liquid forcing to stop suddenly while in motion.

• A properly sized check valve guarantees to provide the prescribed flow while consuming minimal amount of energy which makes it truly cost and energy-efficient.

• It is utmost important to keep a check on the valves for their size before being used for low flow applications. This will ensure that the valves are completely open on maximum fluid flow.

• There are soft seats that offer bubble tight leakage control and the metal sealing surfaces permit some amount of leakage to seep through.

At Evergreen Midwest, you will find a wide range of check valves. Please visit https://www.evergreenmidwest.com/check-valves.html to select a specific type that suits your requirements.

Source - https://www.evergreenmidwest.com/blog/2017/08/28/all-you-should-know-about-check-valves/

Latex and Mylar Balloon Fillers

Evergreen Midwest Co. carries a wide variety of Balloon Fillers, including Latex and Mylar Fillers!

Our balloon fillers are the ultimate product, they ease the job while filling a large quantity of balloons within a few minutes. These balloon fillers are designed to fill balloons to uniform size to prevent the worry of overfilling, causing loss of materials and financial loss too.  Our balloon fillers feature a single unit to fill both Latex Balloons and Mylar Balloons!

We have large variety of Balloon Fillers, including inflators with or without hand-tight connections. We also carry content gauges, so you never have to fear running out of helium unexpectedly again!

Easing efforts of people involved, saving time for other important applications!

Reliable and durable solutions for small-scale and large-scale applications alike!

For more information regarding our Balloon Fillers, please visit https://www.evergreenmidwest.com/balloon-fillers.html, or call us: 800-659-3358.

Source - https://www.evergreenmidwest.com/blog/2018/01/25/evergreen-midwest-co-latex-and-mylar-balloon-fillers/

CO2 Cylinders - Storing of CO2 Cylinders

Anyone storing CO2 cylinders should be aware of the hazards associated with CO2 and should be trained in safe practices of storing CO2 cylinders. Below is a list of suggested safe storage practices of CO2 cylinders.

1. CO2 cylinders should always be stored in a specified area. The storage area should:
a. Be well ventilated. Small concentrations of CO2, as little as 15%, can cause loss of consciousness in less than one minute.

b. Be away from the edge of any elevated area. Falling CO2 cylinders from elevated areas can cause damage to the cylinder, valve, property and personnel.

c. Be away, or protected, from areas with high traffic. Areas of high traffic only increase the chance of an accident occurring.

d. Be dry and free of a corrosive atmosphere

e. Have adequate means to secure all cylinders stored in the area. The means of securing should be sufficient enough to hold the cylinders in place, while not causing damage to the cylinders.

f. Be a continuously cool place. Do not store cylinders adjacent to any source of heat, continuous or intermittent. *For more information regarding the dangers of overheating CO2 cylinders, please visit our blog next week*.

2. Never store a charged CO2 cylinder in a passenger vehicle or in the cab portion of any vehicle.
Empty Co2 cylinders should be stored with the valve tightly closed.

3. Cylinders can be stored standing upright on their base or lying on their side, although it is highly recommended that all

4. CO2 cylinders should be stored as designed, standing upright on their flat base.

5. Cylinders should never be stored where they might become part of an electrical circuit.

6. Cylinders, which have been manufactured to accommodate a valve protective carry handle or a protective cap, should be stored with these accessories installed and in place.

Including all the above in practices of storing CO2 cylinders safely should enhance the safety of all personnel, equipment, and property.

For more information regarding technical support documents on cylinders, please visit www.cganet.com.

Source - https://www.evergreenmidwest.com/blog/2018/02/26/storing-co2-cylinders/

CO2 Cylinders | 10 Great Tips for Safely Filling CO2 Cylinders

It is HIGHLY recommended that only trained personnel fill CO2 cylinders.

1. Perform an external inspection

2. Never fill a damaged cylinder, a cylinder with a damaged valve or a cylinder that has a valve with an altered safety relief device

3. Never fill, or “top off” a partially filled CO2 Cylinder

4. Empty all remaining contents of CO2 Cylinder

• Position it properly: rotate the cylinder so the valve port is facing away from all personnel and equipment.
• If not equipped with a dip-tube, cylinder should be inverted.

5. After moving or positioning the cylinder for emptying, allow a few minutes for any residual CO2 charge to settle before emptying.

• When ready, slowly open the valve, emptying any remaining charge and other contents (moisture, contamination, corrosion, etc.) from the valve.
• When empty, close the valve
• If any content other than CO2 charge is emptied from the cylinder, including any unusual odor, do NOT refill the cylinder. This cylinder should be subjected to further inspections.

6. Place cylinder on calibrated scale (should be able to measure weight with 3 significant digits – XX.X or X.XX, depending on size of cylinder)

7. Secure connection of filling hose to the cylinder

8. Record weight of connected empty cylinder to 3 significant digits. Add this weight to the CO2 charge marked on the crown of the cylinder.

• Connected Empty Cylinder weight (3 sig. digits) + CO2 charge marked on cylinder crown = Target fill weight

9. Open the valve slowly and fill cylinder. This should be done slow enough to accurately monitor the weight on the scale as to not exceed the target fill weight. Once the scale has reached the target fill rate, stop the fill by closing the valve

10. With hose still connected, verify the final weight is same as target fill weight. If the cylinder has been over-filled, discharge the overfill immediately - DO NOT WAIT.

Never over fill a CO2 Cylinder. Overfilling a CO2 Cylinder, even by a small amount, can cause the safety relief device on the valve to actuate and CO2 could be discharged unexpectantly. Unexpected discharge of CO2 gas through an actuated safety relief device has been known to cause accidents, sometimes leading to personnel injury or property damage.

For more information regarding technical support documents on cylinders, please visit www.cganet.com.

Source - https://www.evergreenmidwest.com/blog/2018/02/12/10-great-tips-for-safely-filling-co2-cylinders/

Importance of Cryogenic Valves and Regulators

What is a Regulator?

Regulators are valves. They are responsible for controlling the flow of liquids or gases that are contained within the cylinders and shutting off when the pre-determined pressure is reached. 

Why do I need a Regulator?

Regulators are very useful, if not necessary, in applications that demand controlled pressures. They reduce the chances of hazardous accidents. Gas regulators are a common and essential component of all industrial cylinders. The pressure range for Gas-Cryo regulators is in the range of 100 PSI to 6000 PSI. 

Evergreen Midwest is your one-stop-shop for Regulators. We carry a variety of regulators, including:

• Automatic Changeover Regulators.
• Cryogenic Gas Regulators.
• Inertrol Regulators.
• Liquid Cylinder Regulators.
• Low-Pressure Regulators.
• Oxygen Regulators.
• TapRite Beverage and Beer Tap Regulators.
• And Many More…

We ensure that all our valves and regulators comply with the international standards of valve performance, that all function properly and efficiently when in use.

For more information, please visit: https://www.evergreenmidwest.com/cryogenic-regulators.html, or contact our sales team by email: sales@evergreenmidwest.com, or by phone (800-659-3358).

Source - https://www.evergreenmidwest.com/blog/2018/01/28/importance-of-cryogenic-valves-and-regulators/

Sherwood Valve - Things You Must Know About Sherwood Valves

Sherwood Valve has been serving the compressed gas industry for over 90 years. Founded in 1923, Sherwood has earned a reputation for high quality products that not only keep pace with customer requirements, but also anticipate the changing needs of various industries served. All Sherwood products are designed to meet the highest standards and only quality materials are used.

As an authorized distributor, Evergreen Midwest carries Sherwood's diverse lines of specialty gas, compressed gas, refrigeration products, propane and life support equipment.

GRPV Residual Pressure Valves:

• Prevents backflow of impurities and foreign substances

• Retains approximately 30-50 PSI pressure

• Protects and extends the life of cylinders by preventing ingress of moisture.

GV Global Industrial Gas Valves:

• Use in cylinders containing oxygen, argon, carbon dioxide, nitrogen, helium and hydrogen, as well as welding gas mixtures.

• Pressure Relief Device (PRD) is a unitized plug design that provides excellent flow characteristics, ensures proper assembly and tamper resistance

• Metal-to-metal seal below bonnet threads prevents pressure in the threads at top of valve body

KVA Series - Post-Type Medical Valves:

• Inert PTFE packing provides leak-free stem seal, long cycle life and resistance to corrosion

• Secondary O-ring helps to provide a secure seal under vacuum purging and low-pressure operation

• Chamber design protects threads and stem from damage

Compressed Natural Gas Valves:

NGV, NGVHM & NGRPV Series

• For hydrocarbon-based flammable gases, such as methane and ethane.

• Unique valve core design and lesser internal stress zones

• PTFE backup O-ring and durable Buna-N O-ring that are compatible with flammable gases

• Tapped for dip tube as needed

Chlorine Valves:

• Easy to install due to the large wrench flats on the valve body

• Positive shut-off and exceptional durability in chlorine and other corrosive gas service because of the one-piece Monel® stem

• Valve body made from Aluminum Silicone Bronze that offers corrosion resistance

OxyGen I Series:

Oxygen Valves w/Integrated Regulators

• Compact, Easy-to-Use Design, Reliable, Quality Product

• Designed for ambulatory service applications, combine on/off with reduced pressure for direct patient care

• Ergonomically designed shroud with carrying handles improves mobility and reduces user fatigue

• Pressure gauge located at the top of the unit is clearly visible and protected by the shroud handle

Master Shut-Off Valves:

430 Series

• Safer - There is less chance of ignition from oxygen compression

• Controlled flow and Full flow is achieved when handle is turned two full turns

• PCTFE seat insert and PTFE packing has been used successfully for over 30 years in master shut-off valve applications

Source - https://www.evergreenmidwest.com/blog/2018/03/19/sherwood-valves-introduction/

Sherwood Chlorine Valves - Types of Chlorine Valves & Chlorine Gas Accessories

Sherwood Valve manufactures different types of Chlorine Valves and Chlorine Gas Accessories to better serve the ever-changing various industries.

1. Basic Valve
Manufactured in conformance to Chlorine Institute Pamphlet 17

• One-piece Monel stem offers exceptional durability and positive shut-off on chlorine and other corrosive gas service
• Choice of PTFE or Garlock 6130 Packing for easy operation and durable leak-resistant stem seal
• Large wrench flats on valve body for easy installation
• Robust aluminum silicon bronze valve body offer corrosion resistance

2. Robust Valve

• Featuring a heavy-duty body and packing nut for increased load carrying capacity and resistance against stress, corrosion and cracking
• Approved per the Chlorine Institute Pamphlet 17 Alternate Design Criteria
• Design retains same outlets, inlets, pressure relief device, packing ring, packings, follower, outlet cap, wrenches, yoke and materials (and key features) as the basic valve

3. Basic Chlorine Ton Container Valve

• Conforms to the Chlorine Institute Pamphlet 17
• Durable, leak-resistant stem seal
• Pressure relief device, follower, packing rings, packings, yoke, wrenches, outlet and inlets – all retain the same design as the basic chlorine valve

4. Robust Chlorine Ton Container Valve

• Manufactured in conformance to the Chlorine Institute Pamphlet 17 Alternate Design Criteria
• Large wrench flats facilitate easy installation
• Retaining the same design as the basic chlorine valve with pressure relief device, follower, packing rings, packings, yoke, wrenches, outlet and inlets

5. Chlorine Gas Accessories

• Fusible Plugs
• Yoke
• Flex Connectors
• High Flow Yoke Adapters
• 5928 Charging Valve
• Wrenches (Straight and Twisted)

For more information regarding Sherwood Chlorine Valves, visit www.evergreenmidwest.com or call us toll-free at 800-659-3358.
Source - https://www.evergreenmidwest.com/blog/2018/04/02/sherwood-chlorine-valves-types-of-chlorine-valves-chlorine-gas-accessories/