What is Y pattern check valve?
The “Y”-Pattern check valve is a modified version of a standard check valve. “Y”-Pattern check Valves are generally used to protect pumps or similar equipment, allowing the flow in only one direction and preventing flow reversal due to back pressure with the best possible effort for laminar flow and increased CV.
What is a swing check valve?
In swing check valves, a flapper will swing away to allow forward flow of a fluid or gas. When it is time to stop the flow, the flapper will swing back onto the seat, closing the valve automatically as the system pressure decreases. Swing check valves are notable due to their large flow capacity.
When would you use a swing check valve?
Swing check valves have many uses, from sewage systems and wastewater treatment to firefighting, power plants, and various household items. One of the most commonly known examples of this valve type is the swing check valve that allows water to enter a toilet’s tank while blocking the reverse flow.
How does a piston check valve work?
A piston check valve is, in effect, a lift check valve, whereby flow enters from under the seat. As the flow enters a piston check valve, the piston is raised by the pressure of the upward flow. When the flow stops or reverses, the piston is forced onto the valve seat by backflow and gravity.
How does a swing check valve work?
What is a swing check valve? A swing check valve is mounted with a disc that swings on a hinge or shaft. The disc swings off the seat to allow forward flow and when the flow is stopped, the disc swings back onto the seat to block reverse flow.
Can swing check valves be installed vertically?
We hear many people ask, “Can swing check valves be installed vertically?” The simple answer to that question is yes, swing check valves can be installed in both directions.
What is piston check valve?
Piston and ball check valves, like all check valves, are used to pre- vent back flow in the line. PISTON CHECK VALVE The pressure of the fluid passing through a sys- tem opens the valve, while any reversal of flow will close the valve. In Piston, or lift, check valves a body-guided disc moves within the body bore.
What is the purpose of a check valve?
‘ 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. They require a higher pressure on the input side of the valve than the output side to open the valve.
How do you test a swing check valve?
Slowly open the small test port cap on the top of the check valve until water starts to slowly bleed out. 4. Turn off the supply valve (inlet valve on a meter setter, or other valve upstream of the check valve). The flow should stop coming out of the test port within 2-5 seconds, relieving the pressure in the meter.