Another variation of this mechanism is the clapper valve, used in applications such firefighting and fire life safety systems. A hinged gate only remains open in the inflowing direction. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure.

Check valves, also known as nonreturn or one-way valves, enable fluid to flow one way in a pipeline. A clapper hangs from a hinge, clapper shaft, or pin mounted to the underside of the bonnet. This design inhibits backflow in a line.

2018年8月22日 · The clapper is the interface between the air and the water within a dry pipe valve. It's purpose is to remain closed when air pressure is sufficient in the system, and open when the air pressure falls. The surface area of the clapper is disproportionately larger on the air side than the water side - which is intentional.

This valve is specifically designed to maintain the prime between a pumper and a low level or floating strainer. When pumping through this valve GPMs will not be lowered. Made with 6061T6 aluminum tubing and al-mag castings.

2017年10月26日 · Check valves for fire protection prevent the unwanted reverse flow of water, known as backflow, from occurring. Many check valves feature a hinged clapper with a spring, which keeps the valve closed until the water flowing from some water source opens it.

The clapper check valve is specifically designed to be used with liquid frac, acidizing, and cementing fluids. On jobs where nitrogen is introduced into the frac line, the clapper check valve should be used only in the co-mingled fluid. A dart style check valve is recommended for the nitrogen line. ***CAUTION*** CARE MUST BE TAKEN WHEN ...

These valves come with a clapper that’s attached to a hinge and a clapper shift or pint that’s mounted to the underside of the bonnet within the body of the valve. The clapper lifts and allows fluid to flow through the system in one direction. This causes the valve to open.

The clapper design produces quick, non-slam closure before flow reversal can occur, while meeting FM requirements for an anti-water hammer valve rating. Each valve is hydrostatically tested for leak tightness to 500 PSI.

FPPI small pipe diameter check valves are made from bronze and feature a full floating clapper assembly with soft seat. Clapper design assures proper clapper seating during valve cycle.

Tyco® Model DPV-1 Dry Pipe Valves are differential valves that automatically control the flow of water into dry pipe fire protection sprinkler systems. These valves also provide for actuation of fire alarms upon system operation. The unique, offset clapper design of the DPV-1 helps to minimize both the size and weight of the valve.