A swing valve is a butterfly-style check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. Although swing check valves can come in various sizes, large check valves are often swing check valves.
Thereof, what is the difference between check valve and a non return valve?
What’s the difference between a Check Valve (CV) and a Non Return Valve (NRV)? A check valve is a specific type of valve which can prevent backflow from occurring. Non return valves are similar in design to a check valve but are not able to meet the strict criteria of a check valve.
What is the purpose of a double check valve?
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is also a valve used in air brake systems on heavy trucks. It consists of two check valves assembled in series.
What is a stop check valve?
A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side.
Why are check valves used?
Simply put, a check valve allows flow in one direction and automatically prevents back flow (reverse flow) when fluid in the line reverses direction. They are one of the few self-automated valves that do not require assistance to open and close.
What is the use of gate valve?
The gate faces can be parallel, but are most commonly wedge-shaped. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn’t be used for regulating flow, unless they are specifically designed for that purpose.
What is the use of plug valve?
Plug valves are valves with cylindrical or conically tapered “plugs” which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open.
What is the function of a butterfly valve?
A butterfly valve is a type of quarter turn valve. A quarter turn valve can open or close whenever the handle is turned 90 degrees (a quarter of a turn). The main function of these valves is to control the flow of liquids through a section of pipe. Butterfly valves are mainly used in waste treatment systems.
Where control valves are used?
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.
What is a pressure reducing valve used for?
Pressure Reducing Valves. The 90 Series Pressure Reducing/Pressure Regulating Valve (PRV) automatically reduces a higher inlet pressure to a steady lower downstream pressure, regardless of changing flow rate and/or varying inlet pressure.
What is the purpose of a globe valve?
A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.
What is the use of ball valve?
A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball’s hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.
Can you install a check valve horizontal?
Valve may be installed horizontally or vertically. However, when installed in systems handling solids, valve must be installed horizontally or at a maximum of a 45° angle. Valves have flow direction arrows, horizontal and vertical position markings molded on them.
What is a bypass valve for?
Bypass piping installed to supplement performance is designed to handle excessive pressure or flow, so frequently a valve with low resistance is used in the fully open position. In this type of application, a ball valve is the suitable type of valve.
What is NRV valve?
A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.
Why is there a check valve on a sump pump?
A sump pump check valve is located in your sump system’s discharge line. Its purpose is to prevent discharged water from flowing back into the basin when the pump motor turns OFF. Replacing a check valve should involve only an hour or so.
What is a ball check valve?
A ball check valve in which closing member, movable part to block the flow, is a spherical ball a floating ball valve. In some ball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal.
What is a flow control valve?
A flow control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges.
What is a check valve in a hydraulic system?
A check valve is the simplest type of directional control valve used in hydraulic systems. Check valves stop the flow of fluid in one direction and allow free flow in the opposite direction. They are also known as non-return valves.
What is a pressure relief valve?
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire. As the fluid is diverted, the pressure inside the vessel will stop rising.
What is the meaning of isolation valve?
An isolation valve is a valve in a fluid handling system that stops the flow of process media to a given location, usually for maintenance or safety purposes. They can also be used to provide flow logic (selecting one flow path versus another), and to connect external equipment to a system.
What is meant by non slam check valve?
Non Slam Check Valve. A check valve, clack valve, non-return valve orone-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction. There are various types of check valves (wafer,piston, swing, SSIV) used in a wide variety of applications.
What is a backflow preventer?
A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture.
What is a check valve for a fish tank?
A Check Valve is a simple device used in airline tubing to prevent water running backwards down a air tube and flooding the room. Often when beginners buy a air pump, tubing, airstone, etc. they negligent to fit a check valve. You cut and fit the valve near the top of the aquarium.