The difference between RSV Gate valves and Wedge Gate valves.
Wedge gate valves (a.k.a gate valves) have a metal wedge which is forced against metal seats…
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There are two types of water pressure reducing valves, direct acting and pilot operated; both of which use globe or angle style bodies, with new developments available in an Axial flow configuration. Valves used on smaller piping diameter units are normally cast from brass; while larger piping diameter units are made from ductile iron or steel.
Level control valves are ideal for allowing normal forward flow to fill water reservoirs to a desired high level and where the pilot and valve of the reservoirs are easily accessible. The level control valve can function as a two position valve, either open or closed, or as a modulating control where the valve is allowed to open only to the point where it controls the level to always be at the same “full” point.
Pressure Sustaining and Relief valves do the same function depending on where and how they are installed in a system. They both control the pressure upstream of the valve.
A flow control valve regulates the flow or pressure of a fluid (liquid or gas). Control valves normally respond to signals generated by independent devices such as a flow control meter or a temperature gauge. Control valves are normally fitted with actuators and positioners.
A relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up, leading to an instrument or equipment failure, or in extreme cases, even a fire.
A safety shut down valve (also known as an emergency shutdown valve, or ESD) is an actuated valve designed to stop the flow of a hazardous fluid or external hydrocarbons upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment, or the loss of fluid. Shutdown valves form part of a safety-instrumented system. The process of providing automated safety protection upon the detection of a hazardous event is called functional safety.
The teflon lined butterfly valve is the latest style butterfly valves. Since the standard valve has a lined body and disc, it is capable of resisting attack from even the most corrosive of chemicals.
The rubber lined butterfly valve is a very common valve used in the water industry. Due to the low leakages and ability to withstand reasonably high levels of pressure and temperature, the rubber lined butterfly valve is known for its high reliablity and low maintenance.
Triple eccentric (offset) butterfly valves are used to prevent galling and scratches between the metal seat and the metal disc. Due to its unique design, the only time where the seal comes into contact with the seat is at the point of complete closure.
Double eccentric butterfly valves, also known as high-performance butterfly valves, have the shaft mounted slightly offset from the pipe centerline, and the shaft is mounted behind the sealing band of the seat. The seat is a narrow resilient band, clamped in the body and must be resilient.
A ball check valve is a check valve in which the movable part to block the flow, is a spherical ball. In some ball check valves, the ball is spring-loaded to help keep it shut.
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