What is the purpose of a check valve on a water line?

Since they only allow media flow in one direction, they are commonly referred to as ‘one way valves’ or ‘non return valves. ‘ The main purpose of a check valve is to prevent backflow in the system. Figure 1 shows an example of a check valve. A check valve relies on a pressure differential to work.

What is water check valve?

Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns the valve will close to protect the piping, other valves, pumps etc.

Do mixer taps need check valves?

A shower with a mixer tap (blending hot and cold water) requires a Single Check Valve (type EB) on the hot and cold supplies if the pressures are unbalanced. The check valves are sometimes incorporated in the mixer tap housing.

How to test a chilled water piping system?

Testing Procedure Start Pressure testing of Chilled Water Piping System by closing in proper way all openings of the system with plugs/blanking off and by filling slowly with water using hand-pump or a suitably-sized pump. Ensure water is reached to the entire system by releasing drain/plugs momentarily.

How does a chilled water control valve work?

These chilled water control valves simply regulate the flow of the fluid through them by varying the size of the valve opening, and can work as on/off devices.

Why do you need a check valve in a pipeline?

How does a pressure test for water piping work?

Pipe work will be water sufficiently in advance of the test to allow it to come to room temperature so that any sweating can evaporate. When the systems sufficiently filled the vent valve will be opened and allowed to run freely for a period of 5 minutes to ensure all the air is out of the system, at that point the valve will be closed.

These chilled water control valves simply regulate the flow of the fluid through them by varying the size of the valve opening, and can work as on/off devices.

How does a variable volume chilled water pump work?

Variable Primary Chilled Water Pumping System with some 3-way valves • Single Chiller, Single Variable Speed Pump • 3-way valves for some Chilled Water Coils to maintain minimum flow required for chiller. Chillers have minimum flows that are typically higher than their associated VFDs and pumps.