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/

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/