How does a discharge valve work?
Sensors trigger the valves to open, releasing water into the area, then trigger the valves to close once the temperature within the space decreases as the flames are subdued. Depending on the type of application, a discharge valve may be manually operated or triggered by sensors or some type of computer equipment.
What are the types of valve assembly?
Different types of valves are available.. gate, globe, plug, ball, butterfly, check, diaphragm, pinch, pressure relief, control valves etc. Each of these types has a number of models, each with different features and functional capabilities.
What is bonnet assembly?
An assembly including the part through which a valve plug stem moves and a means for sealing against leakage along the stem. It usually provides a means for mounting the actuator.
What is pump discharge valve?
A pumping system typically requires three valves: an inlet (suction) shut-off valve, an outlet (discharge) shut-off valve, and a check valve between the pump discharge nozzle and the discharge shut-off valve to avoid reverse flow and protect the pump from backpressure.
How pressure release valves work?
How do pressure relief valves work? Relief valves are designed to protect compressed air systems from over-pressurisation by releasing excess pressure. Pressure acts against the valve seat and the force generated opens the valve against a spring tension.
What is valve and types of valve?
Pressure Relief Valve
- Isolation Valves: Ball, butterfly, diaphragm, gate, pinch, piston, and plug valves.
- Regulation Valves: Ball, butterfly, diaphragm, globe, needle, pinch, and plug valves.
- Safety Relief Valves: Pressure release and vacuum relief valves.
- Non-Return Valves: Swing check and lift check valves.
What is bonnet used for valve?
A valve bonnet covers the opening through which the internal parts are inserted. The bonnet serves as the mounting base for the actuator. It includes the seal which prevents fluid leakage along the stem. The bonnet also contains the packing box.
What is valve backseat?
What is a backseat? A backseat is a seating arrangement inside the bonnet. It provides a seal between the stem and bonnet and prevents system pressure from building against the valve packing when the valve is fully open. Back seats are often applied in gate and globe valves (source: wermac.org).
What happens when pump discharge valve is closed?
If the discharge valve is closed and there is no other flow path available to the pump, the impeller will churn the same volume of water as it rotates in the pump casing. This will increase the temperature of the liquid (due to friction) in the pump casing to the point that it will flash to vapor.
Where are valves placed?
Details: Control valves should be at floor level or accessible from platforms. Block, flush, and drain valves should be installed to enable them to be safely removed. Control valves should be located on the same equipment or pipeline as the measurement and downstream of flow measurements.