R & D Multiples

Mahim, Mumbai, Maharashtra

• Optimized liner dimensions ensuring efficient sealing performance.
• Critically controlled interference between the Rubber liner & the Disc sealing surface ensuring leak-tightness & lower operating torque at the same time leading to long seal life.
• Stainless Steel Investment cast Disc as a standard scope of supply.
• For HOPD & Special requirements, contact our Marketing office.

R & D Multiples Dual Plate Check Valves combine the best features with top class workmanship making them unique for any kind of waterworks applications. The clamped resilient seat on Body is a feature which combines high seal integrity & assurance against seal wash-off. Independent spring action for each plate ensures that the spring twist is half compared to the conventional designs. This greatly enhances the life of the springs. Considering features as above & many others, R & D Multiples Dual Plate Check Valves will give you the best in areas of Features, Workmanship, Initial & running costs. This is the best choice.

• Clamped Resilient seal on valve Body. This seal is replaceable on site.
• Independent spring action for each plate.
• The pins are precisely & permanently centered in the valve body.
• The shock dampers ensure that there is no undue load on the Stop Pin & that the spring twist also is maintained in limit.
• Heeling effect for the plates provided to avoid rubbing of the seats near closure.
• Wide choice of materials of construction available: Shell: C.I./S.G.I./WCB/ S.S./ D2: Seats: Rubber with S.S. / S.S. with S.S., pins: S.S.
• Size Range: 50mm to 3000mm, Pressure Ratings: 6/10/16/24 Bar. (Class 150/ Class125)
• End connections: Flanged / Wafer/ Lug Wafer.

• Size range: 150 to 400mm. Pressure ratings: PN10 / PN16 & PN24.
• Material Options: C.I., S.G.I., C.S. (WCB) for Body & Cover, Bronze Dashpot & Seat Ring & Guide Bushes & SS Shaft, Pins, Links & levers.
• Hydraulic Dashpot arrangement to eliminate slam in closing of the AVV.
• Externally adjustable Counter-weight arrangement to set the closing torque.
• Large cowl type covered valve body eliminating any possibility of internal assembly being tampered-with.
• Provision for mounting of an isolating sluice valve & Air Release valve on the body of the AVV is given.

• Large aero-dynamic flow passages ensuring quick entry of large volumes of air.
• Resilient seat fixed into the Valve Body giving drop-tight shut-off during normal operation.
• Critically balanced dashpot, cwt & disc assemblies ensuring that with slightest hint of vacuum formation in the pipeline, the disc opens to allow entry of large volume of air.
• Sturdy, robust cast construction of the valve body & disc. Body provided with swirl busting ribs.
• Non-Ferrous liner bush bearings provided for shaft & pins at all rubbing joints. This minimizes friction, enhances the availability of the valve & increases its service life.

The latest series of R & D Multiples Combination type : (Air Vacuum + Air Release Valves) amalgamates exotic features with excellent workmanship to make them the unique solution for any challenging application. Be it the filling / draining of the pipeline, on-line (under flow & pressure) air release, or the anti-vacuum function at the time of pump tripping, the R & D Multiple's Bi-Stream Air Release Valve' is the ultimate & most reliable solution.

• Very efficient air release/ inlet mechanisms.
• Specially designed tamperproof cover allowing free, all-round (360 Degrees) air movement.
• Stainless Steel Float & Cage design allowing precision, long guides to the Float all through-out the travel ensuring perfectly centred float always.
• Aero-Dynamically designed large flow passages.
• Combination of Air-Vacuum & Air Release functions.
• Sturdy & Robust construction.
• Float not subjected to differential pressure & hence chances of sticking/ necking are precluded.
• Choice of shell MOC : CI / SGI / CS / SS / D2 to suit applications.
• All internal active working parts: Stainless Steel.
• PN10 / 16 /25 Pressure Ratings. (Enquire for Others).
• Complies with the requirements of IS 14845 & AWWA- C512.

• Efficient Aero-dynamic flow passages.
• One Piece Tamper-proof Cover.
• Straight through air release opening of large size.
• Guaranteed long life resilient seats.
• Floats of optimum specific gravity ensuring quick response to level changes.
• Aerodynamic performance tested & proven at FCRI.
• Many, many successful, prestigious installations.

• Sturdy, Compact Construction.
• Non Rising Stem (NRSV) & Rising Stem (RSGV) constructions available.
• Size Range: 50 to 1200mm, Pressure Ratings: PN 10, PN 16 & PN 25.
• Vertical Stem & Horizontal Stem (subject to prior confirmation) installations are possible.
• Accessories such as: Gearing (Spur/Bevel), Thrust Bearing, Actuators (Electrical / Pneumatic), ByPass, Position Indicator, Channel & Shoe, Chain-wheel / Cap-Top operation etc. can be offered.
• Wide variety of materials of construction to choose from: Shell: C.I, S.G.I., C.S. (WCB), D2, S.S. Trim: Bronze, S.S.,

• Sufficient wear travel allowance on the seats.
• Rivetted Seat Rings optionally available.
• Angle fixtures for machining of seat fitting surfaces on Body & Wedge ensure perfect interchangeability.
• Liberally Dimensioned Stem Nut.
• Glandless construction to avoid tampering & water-loss can be optionally offered.
• Machine moulded castings of components ensuring perfect soundness & integrity & consistency.