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/