What is the CV of a check valve?
Valve Flow Coefficient (Cv) is the flow capability of a control valve at fully open conditions relative to the pressure drop across the valve. It is defined as the volume of water (GPM in the US) at 60°F that will flow through a fully open valve with a pressure differential of 1 psi across the valve.
What is modular check valve?
The modular pilot operated check valve MPW, MPA, MPB will allow free flow in one direction and block flow in the opposite direction. It functions to positively hold the actuator in a neutral position.
Where is the check valve located?
A check valve is located in the discharge line of the pump in the basement. They are found in almost every industry where a pump is located outside the home.
How do you calculate Cv flow?
The volume flow rate for liquids can be calculated by multiplying the fluid velocity times the flow area. Thus, Cv is numerically equal to the number of U.S. gallons of water at 60°F that will flow through the valve in one minute when the pressure differential across the valve is one pound per square inch.
How does a pilot operated check valve work?
Pilot operated check valves work by allowing free flow from the inlet port through the outlet port. Supplying a pilot pressure to the pilot port allows flow in the opposite direction. Air pressure on top of the poppet assembly opens the seal allowing air to flow freely.
What is pilot operated valve?
Pilot operated check valves (PO Check Valves) are typically used to hold pressure in a cylinder in the event of a drop in pressure or a total loss of pressure. The pneumatic check valve locks air in the device until the pilot signal is energized, at which time the valve opens and air evacuates the cylinder.
How much does it cost to replace a check valve?
Depending on the size of the system and how much it costs, most homeowners pay between $135 and $1,000. The device costs between $35 and $600, while labor costs between $100 and $400. You can expect to pay between $70 and $250 for a back water or check valve.
What causes check valve failure?
Check valve failure modes associated with wear or poor maintenance can include problems related to noise and vibration from water hammer, reverse flow, leakage or damage. Sticking valves can occur when material like scale or debris is trapped between the valve body and the moving parts such as the disc or ball.