Ball valves use a spherical plug design that contains a bored-in passage. You can operate these types of valves manually by using a lever, which also indicates whether the valve is open or shut, or automatically, by using an actuator.

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Using the USC 10th Edition Field Test Procedure on an ASSE 1013 Reduced Pressure Principle Assembly, if the relief valve opens when the 2nd check is initially back pressured, the tester must then:

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Should you flush the backflow prevention device assembly's test cocks before or after closing the downstream shut-off valve (number two ...

If a certified backflow tester finds that an ASSE 1013 Reduced Pressure Principle Assembly has failed a field test he is required to leave the assembly shutoff until repairs are made and the valve is retested.

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3/4 inch stainless steel check valve is a wafer type non return valve, used to allow fluid or gas flow in one direction while preventing backflow in the ...

Regardless of the industry you’re in, choosing the right type of valves for your application is essential for safety and customer satisfaction.

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The correct use of field test procedures is how we ensure that backflow prevention assemblies will provide the necessary protection to the water system. Any mechanical device or assembly can fail and a robust testing program is needed in any quality cross-connection program. The industry may disagree on which test procedure should be used but everyone agrees that testing in necessary. Its time to pick up your pencil and test your knowledge on the proper use of field test procedures.

Having a basic understanding of your options will ensure you make the right choice. Being informed will help you make the best decision.

It is always necessary to use a sight tube when testing an ASSE 1015 Double Check Valve Assembly with the USC 10th Edition Field Test Procedure.

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When flushing the test cocks on an ASSE 1013 Reduced Pressure Principle Assembly using either the ASSE of USC Field Test Procedures the first test cock opened is:

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This type of valve gives you excellent control of liquid flow through the valve and a secure shutoff when closed. They are often used in sewage treatment, chemical, and paper plants.

When testing assemblies using the USC 10th Edition Field Test Procedure it is required to use a bleed valve arrangement on every assembly type except:

This type of valve is usually used in the oil and gas processing industries, for oil and gas transmission, in water and sewage plants, and in thermal and hydroelectric power stations.

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When using the One Hose or the USC 10th Edition Test Procedure in testing an ASSE 1020 Pressure Vacuum Breaker Assembly the first component tested is the:

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When testing the 2nd check valve on an ASSE 1013 Reduced Pressure Principle Assembly using the One Hose Field Test Procedure the check valve is tested:

If you have any comments, questions or suggestions please contact Backflow Prevention Journal’s Technical Editor; Sean Cleary at sean.cleary@iapmo.org

There are several different recognized field test procedures which when used correctly by certified testers will provide accurate results on the status of backflow prevention assemblies installed as cross-connection protection.

They are ideal for throttling and regulating flow with wire drawing and seat erosion. They are cheaper than gate valves but have greater resistance to flow.

When testing an ASSE 1056 Spill Resistant Vacuum Breaker Assembly using the _________ Field Test Procedure the Vent Valve Screw is removed completely from the assembly.

They are commonly used because they are lightweight, easy to operate, they clean themselves, and there isn’t much pressure drop across the valve when it’s open.

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When testing the air-inlet of an ASSE 1020 Pressure Vacuum Breaker using the ASSE Field Test Procedure pressure is bleed out of the assembly using the:

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Check valves remain open by the flowing fluid. If the fluid reversed, the valve will close. This type of valve includes lift checks and swing checks.

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When they’re fully opened, the fluid will flow in a straight line and there isn’t a significant drop in pressure because of a low resistance to flow.

How do you know which type of valve is best for your system? Keep reading to learn more about the most common types of flow control valves to help you make an informed decision.

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It’s worth noting that although needle valves can control flow with precision, they are usually capable of handling only relatively low flow rates.

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Valves are an integral part of any pipeline system and a significant investment for businesses. It’s important that your engineers understand how all types of valves work.

Using the ASSE Field Test Procedure for backflow prevention assemblies with the exception of the ASSE 1056 Spill Resistant Vacuum Breaker Assembly, the first component tested is the: