Two-way Check Valve

This valve (Fig. 35) allows air to be directed to one delivery pipe from either of two sources. A two-way check valve allows the source applying the higher pressure to shift the shuttle so that the higher pressure will be directed to the delivery port.

Is a check valve a two way valve?

A check valve, also called a one-way valve, is a device that allows the flow of fluids to move only in one direction.

What is the difference between single and double check valve?

A single check valve can be used for fluid category 2 protection, where there may be an aesthetic change such as temperature, taste or odour. A double check valve is used for fluid category 3 protection, where there is a risk of substances of low toxicity such as common disinfectants.

Where do you put a double check valve?

Place the Double Check Valve within 2 feet of the meter box, (See note 5.1 below). 2.2. A tee with a ball valve is required before you install your double check valve. This is to ensure a continuous water supply to the residence during a leak or mechanical breakdown of the sprinkler system.

Why do you need a double check valve?

Double check valves protect the water supply from the risk of backflow and back siphonage in domestic homes and commercial buildings, ultimately preventing potential contaminants getting into other parts of the system, especially drinking water.

What are the 5 types of check valves?

Most common types of Check valves are swing, lift (piston and ball), butterfly, stop and tilting-disk.

Does a double check valve reduce pressure?

Check valves do not reduce pressure, they actually help maintain it.

What's the purpose of a check valve?

What is a 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.

Where should a check valve be installed?

Check valve can be installed in horizontal or vertical piping runs, with the flow running upward. Mounting for vertical installations is critical.

How do I choose a check valve?

Some of the things you may need to consider are fluid compatibility, flow characteristics, headloss, non-slam characteristics and total cost of ownership. For optimal performance, it is of course important to choose your valve respecting the characteristics of each specific installation.

Where do you fit a check valve?

Disc check valves are designed to be located within the bolt circle of pipeline flanges. They are easy to fit, save space and deliver excellent performance at high pressure or high temperature; making them ideal for heating and steam applications.

Do double check valves restrict flow?

yes they do reduce flow rate.

Can you install a double check valve vertically?

If installed in a vertical configuration, it must be a minimum of 6 inches from floor, and no higher than 5 feet to the centerline of the #2 shut-off valve. All assemblies must maintain a sufficient clearance from any wall, and 24 inches in front of assembly to ensure accessibility for maintenance and testing.

What is the difference between a backflow preventer and a check valve?

Check valves use a hinged plug that allows water to pass through the pipeline but blocks it from coming back. Backflow preventers, on the other hand, apply an increased amount of pressure on a pipe to ensure the water can only flow one way.

Is a check valve necessary?

Check valves are necessary if there is a risk of condensate backflow. For example, when a trap discharges into a common condensate collection line, there is the potential risk of backflow from condensate discharged from other traps, so as a rule a check valve should be installed.

Does a washing machine need a double check valve?

You will need one valve for each appliance that is connected to your cold water supply e.g if you have a dishwasher and a washing machine you will require 2 valves.

Does a non-return valve reduce water pressure?

The flow through the non-return valve causes a relatively large pressure drop, which has to be taken into account when designing the system. There are different types of non-return valves, such as spring-loaded, swing type, and clapper type valves.

What are 3 types of check valves?

The three main types of check valves we offer are ball, piston, and stop check valves.

Do you need a check valve on water line?

Water check valves are designed to allow water to flow only in one direction. They are required in all submersible pump installations since they keep water from draining back into the well when the pump is shut off. Check valves help prevent a few undesirable conditions in systems.

What is the other name of check valve?

A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.