Retention valve
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Check valve allows drinking water to flow into pipes, pumps and accessories in a single direction and prevents a possible reversal of flow direction.
If the direction of flow is reversed, They close automatically and open again when the flow direction is correct. This way, Check valves prevent pipes and tanks from emptying and pumps from experiencing reverse flows.
Examples of non-return prevention include valves, trampillas, check valves, check valves and gravity brakes.
There are several types of check valve:
- Oscillating flap valve: an oscillating flap acts as a shutter and closes the passage, by gravity, when the fluid flows in an undesired direction. They work by gravity, so they must be placed in a certain position.
- spring valve: It is not necessary for them to maintain a certain position, since its operation does not depend on gravity; There are two types of these
in one, a spring calibrated to a certain pressure, holds a shutter over a sealing ring; The pressure of the water overcomes the resistance of the spring, allowing the fluid to pass through., but the spring closes the passage when the fluid flows in the opposite direction;
in the other, double clapper call, two semicircular clappers, they rotate on an axis, closing the way when they are aligned; a spring keeps them in position, but it does not intervene in the retention. It has less pressure loss than the previous one, In exchange, the closure is less watertight.. - piston valve: a plunger, ending in a shutter rests on the sealing ring; is housed in a cylindrical piston so that the fluid, when passing in the right direction, lift the plunger, but when changing direction, the plunger sits on the ring; The shape of the plunger support helps the receding water pressure to squeeze the plug onto the sealing ring. like the first, requires to be mounted in proper position, Well it also works by gravity.
- Ball Check Valve: It is a special type for well extraction pump terminals, For example; a ball sits on the sealing ring; when the pump extracts water from the tank or well, the ball is lifted and placed in a lateral housing so as not to hinder the passage, but when the pump stops, returns, by gravity, to its closed position to prevent the pipe from emptying.
