Its streamlined body contouring, flow area 40% greater than nominal pipe size and hydrodynamic disc combine to provide the lowest headloss of any check valve produced today. Tilting disc check valves with hydraulic damper eliminate the closing slams and water hammer for entire closing stroke. 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. The tilting disc valve accomplishes full flow opening by having the disc pivot or tilt in the flow of the media, which causes the td series to have an incredibly low opening stroke range.
Tilting disc check valve wtop dashpot the vagga industries tilting disc check valve features a streamlined design and full flow area for lower full open head loss than conventional swing check valves. The seat 6 is held in place by the two body halves. Turk extraction check valve overview and applications. The body consists of a pivot body half 1 and a seat pivot half 5. Closing speed is adjustable depends on working conditions. Cast steel tilting disc check valve pdf free download. The check valve shall be of the tilting disc type as manufactured by henry pratt company.
But here is where the similarities to traditional swing check valves end. If the back flow reaches to check valve before the disc closed, the result will be slammed closing and water hammer. The valve achieves full opening when the disc tilts in the flow of the. A top mounted oil dashpot may be included to control the opening and closing of the valve.
Newco cast steel bodies provide low resistance flow and optimum strength and performance. It is also available in ansi and api standards see catalogue sheet fk 30. Tilted disc check valve operation, maintenance and installation introduction this manual will provide you with the information to properly install and maintain the check valve to ensure a long service life. The angle of incline and roll angle for tilting disc check valves is 30 max. The seal member abuts an annular face extending about an inlet passage of the valve and the opposing face of the seal member is abutted by a clapper support member, forming a portion of the clapper assembly, having the form of an interrupted ring.
Solution tilting disc check tdc valves are designed for use in applications where rapid response fast opening or closing is required. Gates globes angles swing checks tilting disc checks. This design reduces substantially the weight of the valve as well as the face to face dimension. Shafts protruding on both sides facilitating individual mounting of the weightloaded lever.
Cast steel bolted cover tilting disc check valves sizes. Free swing disc design for minimal pressure drop and wear. Tilting disc check valvealloyduplex stainless steel tilting disc check valve pressure rating. Tilting disc check valves with hydraulic damper eliminate the closing slams and.
Preferably, the valve is to be stored horizontally on its inletside flange or in an upright position on its flange feet with the bearing bushes pointing to the top cf. Tilting disc check valve tilting disc check valve td crispin valve, 600 fowler ave. In most installations, slamming is minimized upon reversal of flow so noise and vibration are reduced. The center of gravity of the anchordarling tdc disc is very close to the axis of rotation thus, the. It is also available in bs, din and ss standards see catalogue sheet fk 30. Carbon steel,100% quantity tested before delivery established in 1985,didtek valve is a professional supplier of industrial valves for major.
Tilting disc check valves are similar to swing check valves. The invention discloses a tilting disc check valve, which includes a left valve body 1, a right valve body 2, a large valve plate 3, a small valve plate 4 and a diaphragm control group 5, wherein the left valve body 1 and the right valve body 2 are butted into a whole through oblique openings. With lever and weight metallic sealing with synthetic resin coating for higher temperatures vag reta check valve body seal suspension of the disk cover disk. The vag skr slanted seat tilting disk check valve is to be stored with the disk in closed position. Thanks to geometric similarity, these values can be applied to other nominal diameters for approximate calculation.
Newco cast steel tilting disc check valves yield minimal restriction to lowvelocity environments and are ideal for preventing backflow in unidirectional flow applications in horizontal flow piping. Tilting disc check valves when the check valve must be operated by a very small pressure drop this design is used. Unique design gives excellent tightness and minimizes waterhammering. See the dashpot section in this manual for maintenance. This value applies to steel valves having a stop angle of 5.
The pratt tilting disc check valve is designed to open after pump start and allow water. Stop check valves tilting disc check valves are similar to swing check valves. Installation of tilting disc check valve and butterfly valve. The unbalanced disc weight heavier below the pivot point causes the slanting disc to free fall into shutoff position with minimal reverse flow and open with a. The tilting disc check valve shall consist of a circular disc with. This manual will provide you with the information to.
They are available with metal to metal seats and soft seats. Tilting disc check valves problem provide a check valve with quick response and no water hammer effect. Stop check valves are essentially the same as globe and angle valves, except there is no mechanical connection between the stem and disc. Tiltingdisc check valves, short body to din 3202 series f4 for liquids and gases, pn 10 pn 40, dn 150 dn 2000 fieldapproved design doubleoffset free swinging disc stainlesssteel disc facing with resilientrubber precision sealing stainlesssteel body seat lever connection facilities provided on both sides. The shafts are in maintenance free, selflubricating friction bear. Check anyway with orion if the valve is suitable for the desired installed position. The universal check valve with double excentric valve disc a key component of the erhard erk tiltingdisc check valve is the valve disc which has a freely oscillating, flowfacilitating design with double eccentricity support.
The most important benefit of nozzle check valves is, the long troble free. In tilting disk check valve, the disc blocks flow, swings on a hinge or trunnion, either onto the seat or off the seat to allow flow. Its energy efficient operation is combined with a short 40degree disc stroke that provides quick closing valve to minimize hammer. Most crane swing check valves can be installed in horizontal or vertical, upward flow, piping. The nafcheck valve is available in ansi and api standards. The cni twopiece tilting disc check valve will be fully open at velocity heads of approximately 0. Tilting disc check valve,cast steel tilting disc check valve. Kvt swing check om english 2011 key valve technologies. The plug gasket creates a leakproof seal between the plug and body. The ga industries tilting disc check valve features a streamlined design and full flow area for lower full open head loss than conventional swing check valves. The tilting disc design helps to reduce the slamming of the disc when backflow occurs.
Size 224, ansi class 150 and 300, naf 526440 528661. Figures 7125td, 7125tu tilting disc check valve wtop dashpot. The tilted disc check valve is ruggedly constructed with aluminumbronze or stainless steel trim to give years of trouble free operation. A key component of the erhard erk tilting disc check valve is the valve disc which has a. Designate the valve size and the complete catalog number, including prefix and suffix letters. Ga figure 7125t tilting disc check valve, with top dashpot. The disc is rotating about an axis located in the flow.
The entire valve is a cast design for better strength and stability. Comparison of swing and tilting check valves flowing. The shafts are in maintenance free, selflubricating friction bearings, and the shaft has maintenance free seals. Tilting disc check valve jfs reserves the right to change specifications without notice. This reduces the opening and closing times critical to controlling flow reversal and reducing water hammer. Placing a check valve in the opposite direction to the flow will prevent the disc from swinging free and will the there fore prevent normal operation of the valve precaution. The design of the tilting disk enables the valve to open fully and remain steady at lower flow rates and close quickly when the forwarding flow stop. The fabricast fig 6 is a fabricated and welded tilting angle disc check valve. These valves are designed as maintenance free and can be supplied metal to metal or with resilient sealing.
Reducing the size of the tilting disc should be considered at these values. All sempell dewrance tilting disc check valves are based on the same seat geometry of a conical seated disc in a conical body seat, which has been applied over a wide range of conditions from subatmospheric bled steam up to asme 2850 class for steam and water. To maintain disc stability, velocity heads for gaseous flow should not be less than 0. The opening stroke range is much less than those of the conventional swing check valves, therefore reduces opening and closing time critical to controlling flow reversal and reducing water hammer. The design of the valve allows it to be fully open at very low flow velocity. Guidelines for the selection of check valve type application swing check tilting disc lift check. Ozkan tilting disc check valve hygrade water new zealand. Hydraulic feactures measured curve of a tilting disc check valve dn 500, pn 10, with weightloaded lever, mounted on horizontal pipe, for water at 20c. Tilting disc check valve operation and maintenance manual. The center of gravity of the disc and the oblique seat makes the valve close fast and reduces the risk of pressure shocks. The opening stroke range in much less than that of the coventional swing check valves, therefore reduces opening and closing time critical to controlling flow reversal and reducing water hammer.
An investigation of the dynamic characteristics of a tilting. The tilted disc check valve is an excellent choice for raw water, cooling water and treated waterwastewater applications. The budgetary quotation for these valves has been attached to. The seat opening crosssection may be perpendicular to the centerline between the two ports or at an angle. The tilting disc and 2 pieces bodies designed check valve accomplishes full flow opening by having the disc pivot or tilt in the flow media. Nafcheck tilting disc check valves dn 40, pn 10 pn 40, naf 526520 528630 fk 30. Available in both top and bottom mount configurations. A tilting disc check valve is provided with a valve assembly comprising a clapper assembly and an annular seal member. Flow control valves are specialized needle valves that allow free flow in one. The tilting disc type valve is designed to overcome some of the weaknesses of conventional swing type valves.
Tilting disc check valves top entry are best fit for horizontal pipeline installation, thus they can be used even in vertical piping with upward flow. The tilting disc check valve shall consist of a circular disc with conical rim, hinged about a fixed pivot above its centerline and offset from the plane of the seat, sealing against a body seat clamped between the two sections of the valve body. The check valve is seen from the side, with the valve housing surrounding the movable disc and a weighted lever attached to it. Dual plate check valves valves provided with double disc and spring.
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