Check Valve Before Gate Valve

Plumbing gate valve failure.

Check valve before gate valve.

Check valves are used in a wide variety of locations but the focus of the discussion in this tutorial will be the installation of check valves at the steam trap outlet side. When multiple water supplies serve the same fire sprinkler system each must have a check valve. Normally valves are pressure tested by the factory to check for leaks before they re shipped. Bloch and budris 2004 gate valve should not be between check valve and pump.

From the 2016 edition of nfpa 13. The purpose of these tests and the expected results are often misunderstood and misapplied resulting in unnecessary delays and unanticipated costs. When the valve is wide open the gate is fully drawn into the valve bonnet. Gate valves use a sliding plate within the valve body to stop limit or permit full flow of fluids through the valve.

5 gate globe check valves gate valves design standards test inspection methods acceptance criteria test inspectionbolted bonnet gate valve api 600 iso 10434 asme b16 34 pressure seal gate valve long short pattern visual inspectionasme b16 34 api 603 gate valve api 603 api 6dthrough conduit gate valve. Before the resilient seated gate valve was introduced to the market gate valves with a metal seated wedge were widely used. Gate valves are used when a straight line flow of fluid and minimum flow restriction are needed. 8 16 1 1 3 1 where there is more than one source of water supply a check valve shall be installed in each connection.

A check valve clack valve non return valve reflux valve retention valve or one way valve is a valve that normally allows fluid liquid or gas to flow through it in only one direction. Plumbers nowadays install ball valves in water lines to control flow. The check valve is placed between the pump and the gate valve and protects the pump against reverse flow in the event of unexpected driver failure pump user s handbook. There are various types of check valves used in a wide variety of.

The conical wedge design and angular sealing devices of a metal seated wedge require a depression in the valve bottom to ensure a tight closure. Generally both a check valve and a gate valve are installed in the discharge line. A check valve is a type of valve that allows fluids to flow in one direction but closes automatically to prevent flow in the opposite direction backflow. The gate is usually wedge shaped.

But years ago well before the development of ball. The type and method of testing conforms to one or more of many different standards.