Awwa c50809 swingcheck valves for waterworks service 2in through 24in 50mm through 600mm nps mss sp71 testing gray iron swing check valves mss sp6 testing ductile iron swing. Pressure drop chart check valves sure flow equipment inc. Although swing check valves can come in various sizes, large. Check valves may also be designed with seals that will crack under excess pressure to. Suitable for all type of fluids and aggressive environments like. The pressure of the fluid passing through a system opens the valve, while any reversal. Wog cf8m 200 wog gate valve 3 4 backflow preventer watts backflow watts backflow preventer valve fig 600 wog valve 200 wog pvc ball valve relief valve set ball valve 600 wog wog apollo ball. Although often used with liquids, check valves are also used in industrial processes which handle gases and chemicals. Lower cracking pressures available on customers special order. It is suitable for use in a variety of orientations. The seat opening crosssection may be perpendicular to the centerline between the two ports or at an angle. Cast carbon, stainless steel swing check valves to api 600, boted bonnet stellite hardfaced seat.
Whilst many different types of check valve exist an important consideration that can often be overlooked is the cracking pressure of the valve. Pressure drop in swing check valve posted in refining, hydrocarbons, oil, and gas. Societa a socio unico soggetta alla direzione e coordinamento da parte di velan inc. A springless check valve mounted in the same way will have a cracking pressure determined by the weight of the liquid above it. Tom wheatley swing check valves are available with either an integral seat or renewable seat. An inexact but informative way to test cracking pressure a simple air pressure test is an easy way to estimate the cracking pressure of a spring loaded. Swing checks have a hinged door shaped like a disc that hangs inside of the valve. China swing check valve manufacturer, supplier, factory. A swing check valve is a butterflystyle 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. Velan is a world leader in the design and production of a wide range of cast and forged steel gate, globe, check, ball, triple. The minimum upstream pressure required to operate the valve is called the cracking pressure, generally between 1 and 5 psi. An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will. Velan is regarded as one of the worlds leading manufacturers of steel gate, globe and check valves, with more than 10 manufacturing plants worldwide. We are the largest distributor for velan and omb valves in the u.
Can be used with steam, air, gas, water, and vapor lines with high flow velocities, can be installed in lines with vertical flow, available with renewable seat rings. Although swing check valves can come in various sizes. Get the best deals on stainless steel body 1 12 in diameter check valves when you shop the largest online selection at. Differences between swing check valves and spring check. A swing valve is a butterflystyle 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. Ballseal poppet, softseal poppet or dualseal ball check valves are available with working pressures up to 60000 psig 44 bar and a nominal cracking pressure of. Stainless steel body 1 12 in diameter check valves ebay. In any situation where backflow could cause problems, swing check valves are the goto. Standard valve design has no spring in order to minimize cracking pressure and. Swing check valves are the most common type of valve in water and wastewater pumping systems.
Cracking pressure is the inlet pressure at which the first sign of flow occurs. A renewable seat extends the life of the valve by allowing all internal parts and seals to be replaced with. The outside diameter of the body is equal to the bolt circle pcd minus the diameter of one bolt. A more precise way to describe check valve cracking pressure is to say that it is a measure of the pressure differential between the valves inlet and outlet ports when flow is first. Parker c series brass check valve, 1 psi cracking pressure, 18 npt female. Swing tiltingdisc check valves consist of a clapper with a disc that is convex on the upstream inlet side and flat on the downstream outlet side. Today, vogt valves supports a worldwide network of distributors with access to the worlds largest capability for the manufacturing of forged steel valves and fittings. For api spec 600 valves, this disc swings on a hinge that is mounted to the bottom of the valve bonnet. A swing check valve or tilting disc check valve is a 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.
If this pressure is less than the cracking pressure the check valve will remain fully closed and the fluid will deadhead behind it. Each valve is pressure tested in accordance with api 598 or special. Dead tight sealing at any pressure will hold air or fuel pressure indefinitely with zero leakage even at back pressure as low as 1. Vertical installation flow direction downif the valve flow direction is down, the weight of media pushes against the valve spring. Sizes nps 26 dn 50150 may have solid ca 15 cr disc. This is highly unlikely you have 1500 psi and a cracking. It is generally recommended, that when using kennedy swing check valves, that you locate the valve at least 5 to 10 pipe diameters down stream from any flow disturbance or obstruction valve, pump. Wog cf8m 200 wog gate valve 3 4 backflow preventer watts backflow watts backflow preventer valve fig 600 wog valve 200 wog pvc ball valve relief valve set ball valve 600 wog wog apollo ball valve bronze gate valve kunkle valve valve backflow brass gate valve bronze ball valve 1 stainless steel ball valve 34 gate valve milwaukee valve georg fischer 2 brass ball valve pvc ball valve 2. When fluid pressure in the valve is higher than the cracking pressure, or the pressure needed open or close the valve, the spring lowers the disc to prevent reverse flow. If there is not enough flow, disc movement occurs inside the valve. A swing check valve is a butterflystyle 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. Hardfaced with cr, cocr alloy, ss 316, or monel, ground and lapped to a mirror finish. Our bronze check valves are of superior quality and. The outside diameter of the body is equal to the bolt circle pcd minus the diameter of.
Today, vogt valves supports a worldwide network of distributors with access to the worlds largest. Velan cast steel swing check valve control specialties. For api spec 6d valves, the typical construction is a cast pocket in the valve body with a dropin shaft or pinandbushing arrangement. Velan forged cryogenic gate, globe and check valves are specially designed to. The sure flow check valve is designed so that it is centralized between the flanges when the stud bolts are in position.
It is generally recommended, that when using kennedy swing check valves, that you locate the valve at least 5 to 10 pipe diameters down stream from any flow disturbance or obstruction valve, pump, elbow, reducer, etc. This type of installation increases the check valve s cracking pressure. In horizontal lines the valve is installed with the pins vertical i. One iteration of the swing check valve is a spring check valve.
An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Nibco wear on body suggest prior use testing results. Optional integral cocr alloy hardfaced seat available for longer service life. But because of the long stroke and inertia of the disc, the traditional swing check valve may slam in vertical pipe installations. Cracking pressure is the minimum upstream pressure that the valve will operate at. Not in original manufacturer packaging specifications 125 psi8. A swing check valve or tilting disc check valve is a 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. Check valve bronze ring check, ptfe disc, threaded ends t480y 125 psi8. Water, cold water, potable water, wastewater, other. Our bronze check valves are of superior quality and can be matched to meet your project or replacement needs. They are low cost, and have low head loss characteristics when fully open. Can be used with steam, air, gas, water, and vapor lines with high flow velocities, can be installed in lines with vertical flow, available.
An important concept in check valves is the cracking pressure which is the minimum. The swing check valve functions by allowing flow forces to move the closure element, it is a. Two common types of check valves are ball cone valves and swing check valves. If there is not enough flow, disc movement occurs inside the valve, since the disc is always in the flow path. Typically the check valve is designed for, and can therefore be specified for, a specific cracking pressure. If you are using internet explorer 6, you may have to right. This means the valve s cracking pressure needs to be selected so that it is high enough to neutralize the weight of the liquid in the pipe or tube above the. Swing check valve description swing check valves, like all check valves, are used to prevent back flow in the line. Jun 04, 2019 a more precise way to describe check valve cracking pressure is to say that it is a measure of the pressure differential between the valves inlet and outlet ports when flow is first detected. Velan is a world leader in the design and production of a wide range of cast and forged.
A renewable seat extends the life of the valve by allowing all internal parts and seals to be replaced with the valve body still installed in the pipeline. The two disks fold together upon positive flow and retract to a full. Parker c series brass check valve, 1 psi cracking pressure. This results in wear, potential for failure, and a higher pressure drop than calculated. Pressure from the fluid entering the inlet pushes the door open, allowing flow through to the outlet. Eped valves thus noted are constructed under the european pressure equipment.
I have checked various charts and correlation for pressure drop in swing check valves but. Size ranges nps 14 2 dn 8 50 pressure rating asme classes 150 1500 standard connections threaded, socket weld, flanged. It is illegal to install products that are not lead free in accordance with us federal or other applicable law in potable water systems anticipated for human consumption. Turbulence close to the check valve may result in valve chatter resulting in premature failure of the check valve. A swing valve is a butterflystyle 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. Cast iron swing check valve packaging condition details. The degree of opening on a check valve is determined by the flow rate. Non return valve with swing arm suitable for pipeline pigging.
Standard valve design has no spring in order to minimize cracking pressure and pressure drop, it will only function properly when installed in a horizontal line. Low cracking pressure check valve posted in industrial professionals. The swing check valve has a flat disc that pivots or swings about a hinge pin. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. Nibco f918b cast iron swing check valve 3 200 psi left side. Velan is a world leader in the design and production of a wide range of cast and forged steel gate, globe, check, ball, tripleoffset butterfly, knife gate, highly engineered severe service valves, and steam traps offering superior performance across all major industrial applications. Silent check valves are constructed with a springassisted disc. Exclusive agent of velan part technologists of energy co. While swing check valves rely on gravity to close when there is no flow, the disc on a spring check valve is held closed by the tension of a spring inside of the valve. Back pressure refers to the difference in pressure between the inlet and the outlet of the valve. Feb 26, 2019 swing checks have a hinged door shaped like a disc that hangs inside of the valve.
A doubledisc or wafer check valve consists of two halfcircle disks hinged together. Vogt valves, sulphur springs, tx vogt valves a history in the making. Swing check, piston check, nozzle check and wafer single, dual and spring check. Ballseal poppet, softseal poppet or dualseal ball check valves are available with working pressures up to 60000 psig 44 bar and a nominal cracking pressure of 15 psi 1. H 2 o maximum on standard production models of 800 series check valves. The seat opening crosssection may be perpendicular agency standard.
As mentioned earlier, unlike onoff valves, check valve internals are flow sensitive. A ball cone valve utilizes a springloaded ball seated against a coneshaped interior surface to stop the flow of fluid in a forward direction, and a swing check valve has a movable disc. Sealing materials are selected for the valve service conditions. Mss sp80 bronze check valves for over 170 years powell valves has been a leading manufacturer of industrial valves, including bronze check valves.