For valves size 24 and smaller, the check valve is also equipped with external counterterbalance. Utility swing check valves are designed for horizontal installations, but may be installed in upflow only vertical position. Swing check valves include sealing elements consisting of organic material, that reacts to environmental effects. Trim number 1 may be replaced by trim number 8 without notice. Wafer check valves reduce the effect of water hammer fm approved for such service. Check valve swing check valve air cushion the traditional swing check valve is defined in awwa standard c508, has metal or resilient seats, and swings through a 60 to 90 degree stroke. Swing check valves allow liquid to flow in a single direction. Model 78 is a unique flapper style swing check that permits flow in one direction only and is tight seated when the outlet pressure exceeds the inlet pressure. Pdf this paper provides information on swing check valve selection criteria suitable for nuclear power plant applications.
Dn200 pvc or gfpp twoinone seat counterweight optional heavy duty body clapper assembly flange oring seal o. The secret to the tom wheatley swing check valves success is. Outside lever check valves may be fitted with a limit switch to detect flow. Swing check valve description swing check valves, like all check valves, are used to prevent back flow in the line. Check valves must be installed with the valves flow arrow pointing in the direction of the flow. Particular check valves perform additional services as follows. For gritty liquids, a composition disk is advisable to reduce damage to the seat. The ring is in forged stainless steel and is part of the trim. Counterbalance arms and weights counterbalance arms and weights for use with crown swing check valves.
Hd swing check valve can be installed vertically or horizontally with flow direction as marked on the valve. Valves shall incorporate a single disc design suitable for either horizontal or vertical installations. The swing check valve functions by allowing flow forces to move the closure element. It is designed, manufactured, and tested in accordance with api6d q1 unless otherwise specified. They offer low resistance to flow and are particularly suited to low velocity service. Ask us how to spec the right check valve, or get catalogs, chemical resistance guides and submittals.
The pin can be easily removed for maintenance of the valve. Products cast steel bolted bonnet valves swing check. Pdf swing check valve design criteria and cfd validation. When corrosive atmospheres andor contaminated water supplies are present, it is the owners responsibility to. Check valves shall be ductile iron body, bronze and stainless mounted, full opening swing type. The valmatic swing check valve incorporates many design features and characteristics that will provide energy savings, ease of maintenance and extended valve life. All swing check valves shall be of solid thermoplastic construction, having no metal. The seat opening crosssection may be perpendicular to the centerline between the two ports or at an angle. Swing check valve 3 3 general instructions for transportation, unpacking and storage when suspending and supporting a valve, take care and do not stand under a suspended valve. The basic design of a check valve inhibits backflow in a line. Because of the long stroke, inertia of the disc, and friction in the. Therefore, they are to be stored in a place, which is also to be kept as cool, dry and dark as possible. July, 2016 specifications for swl swing check valves general. Valco groups product portofolio contains strong and well established valve brands from inhpuse production, as well as provision of third party products.
Operating instructions a2600 series awwa swing check valve. In vertical installations, typical swing check valves must have an offset pipe section installed since these valves only function in a horizontal position. Bonnet check valve and significantly reduces costs. The swing check valve must be installed in an area not subject to physical damage.
Inspection of valve during operation is recommended so that. The swing check valve is manufactured with a ductile iron body, brass seat, and a rubberfaced clapper assembly, hinged to a removable access cover for easy inspection and maintenance. 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. When a check valve is needed to prevent backflow, nibco has a complete lineup, including the nibco ring check with selfclosing disc, horizontal swing, sliding disc, silent check and y pattern. Swing check valves installation instructions models 78 flomatic corporation flomatic corp, 15 pruyns island, glens falls, new york 12801 phone. Near pumps with unstable flow, use av swing check valves. A conduit clapper profile that closely matches the valve bore helps to guide the pig through the body of the valve and into the downstream pipe.
The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. Stop check valves tilting disc check valves are similar to swing check valves. Wheatley swing check valve prevents backflow in a fraction of a. While they may hold pressure in the reverse direction, they are not intended for use as isolation valves without special provisions e. Swing check valves are to be transported in their original packaging and to be stored in a clean location.
Kvt om manual, hifluidic swing check valves key valve. Swing check valves prevent reversal of flow through pipe lines. Class 125 threaded cap brassbonze disc threaded ends figure 37 class 125 threaded cap ptfe disc threaded ends figure 41tf. Robust onepiece construction to withstand the severe shock of check valve service.
Designed to prevent backflow in horizontal piping systems. The viking swing check valve is a general purpose rubberfaced check valve approved for use in fire protection systems. Most crane swing check valves can be installed in horizontal or vertical, upward flow, piping. Swing check valves may be mounted vertically with flow upward or horizontally. Swing check valves ansi swing check valves class 900 dimensions and weights nom size in 2 21. Operating instructions a2600 series awwa swing check. In these valves, a clapper hangs from a hinge, a clapper shaft, or a pin mounted to the underside of the bonnet.
The valve is designed for municipal and industrial water and wastewater applications and fully complies with ansiawwa c508 and mss sp71mss sp6. Swing check valves ansi swing check valves class 150 dimensions and weights nom size in 2 21. Inspection of valve during operation is recommended so that outside linkage can be inspected for proper operation. The tom wheatley check valve is designed to facilitate pigging operations and to protect instrumentation on intelligent pigs. Api 594 cast steel swing check valve quick sheet qs velan. Kfs diversity in check valve configurations and materials of construction provide opportunities to service customers in many different markets. The swing check valve functions by allowing flow forces to move the closure element, it is a. Minimum back pressure to close valve psi cv values troubleshooting what if valve leaks through the seat. For additional types of check valves, please visit.
Check valves shall be of swing check flapper type and meet materials requirements of awwa c508. Selection check valves are for the prevention of backflow. Our experience has demonstrated our capability to handle the combination of high pressure and very low temperatures. A broad range of configurations that includes piston, tilting disc, springloaded disc and dualplate models meets the critical, hightemperaturepressure demands of the worlds major industries. Api swing check valve is a casted full bore valve, swing check type, horizontal mounting, manufactured. Valve body shall be enlarged to allow disc to swing in the waterway. Leakfree, tight sealing, protection against reverse flow and minimal flow direction changes are at the core of flowserve check valve designs. The regular swing check valve is not suitable if there is frequent flow reversal due to the pounding and wearing of the disk. Series 8001 swing check valves are of selfcontained, free swinging disc. Armtype check valve prevents fluid resistance increase. Petrolvalves experience in the swing check valve design grew faster and faster, driving the company to challenge itself with more and more complex products, such as large. Mueller canada offers several types of check valves including. Hardfaced with cr, cocr alloy, ss 316, or monel, ground and lapped. The model 78 swing check does not require any regular maintenance.
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