What is a check valve in oil and gas?
1. n. [Well Completions] A mechanical device that permits fluid to flow or pressure to act in one direction only. Check valves are used in a variety of oil and gas industry applications as control or safety devices.
What is the purpose of a two way check valve?
A two-way check valve allows the source applying the higher pressure to shift the shuttle so that the higher pressure will be directed to the delivery port.
Is a back pressure valve the same as a check valve?
Backflow occurs when pressure changes in pipes cause the flow of liquids, gas, or semisolids to reverse in the wrong direction. Check valves are designed to ensure substances in a pipe only flow one way, automatically closing to prevent unwanted backflow if the direction is reversed.
What is the main function of the downhole check valve?
A downhole safety valve is a piece of safety equipment used inside a well, which isolates wellbore pressure and fluid if something bad happens. The main function of the downhole safety valve in a well is to contain that well in a safe condition in the event of a catastrophe.
Where are check valves used?
Check valves are often used with some types of pumps. Piston-driven and diaphragm pumps such as metering pumps and pumps for chromatography commonly use inlet and outlet ball check valves. These valves often look like small cylinders attached to the pump head on the inlet and outlet lines.
What is difference between single and double check valve?
A single check valve can be used for fluid category 2 protection, where there may be an aesthetic change such as temperature, taste or odour. A double check valve is used for fluid category 3 protection, where there is a risk of substances of low toxicity such as common disinfectants.
What is the difference between an RPZ and a double check valve?
Double check valves are used for non-health hazard cross connections in continuous pressure applications. RPZ backflow preventers include two check valves like a double check backflow preventer, but they also have an intermediate relief valve that opens to atmosphere if both check valves should fail.
What is spring check valve?
Spring check valves typically have hollow bodies and a large stopper, which receives constant pressure from a spring. When gas or fluid flows forward at sufficiently high pressure, the force will overcome the pressure from the spring and cause the stopper to open, allowing the desired flow.
How does Sssv work?
Working Principle: This movement compresses a large spring and pushes the flapper (in case of flapper type SCSSV) or the ball (in case of ball type SCSSV) downwards to open the valve. When hydraulic pressure is removed, the spring pushes the sleeve back up and causes the flapper (or the ball) to shut.
What is Scssv?
1. n. [Well Completions] A downhole safety valve that is operated from surface facilities through a control line strapped to the external surface of the production tubing.
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