Double Check Valve

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Double Check Valve

Double Check Valve is technically two single check valve cast in adjacent sequence. A single check valve stops the backflow of liquid or gas, but little quantities liquid or gas have passed back along the piping before it closes.

Generally under negative pressure the water that briefly bypasses the first check valve and causes it to close is stopped from going any further by the second check valve which closes at the same time.

In theory two single check valves placed side by side in series anywhere lengthwise in a piping system will act jointly as a double check valve, but the farther they are placed more likely it is that something will act to stop them to work.


Application of Double Check Valves are Hydraulic Fluid Transfer, Sea Water, chemicals

There are different types of Double Check Valve Couplings we manufacture by materials such as:
SS 304 Double Check Valve, SS 304L Double Check Valve, SS 316 Double Check Valve, SS 316L Double Check Valve, Monel Double Check Valve, Duplex Double Check Valve, Inconel Double Check Valve, Aluminium Double Check Valve, Brass Double Check valve.

Type of Double Check Valve

Female Coupler
Female Adapter


QRC SIZE (D1) D2 D3 L1 L2 L3 L4 L5 L6 L7 L8 H
1/8" 16 20 43 35.8 7.5 14 14 30 14.2 15.8 14 A/F
1/4" 22 28 58 48 11 18 19 36 13 23 19  A/F
3/8" 26 35 65 52 14 20 22 40 14 26 22  A/F
1/2" 32 42 71 56 15 24 28 45 19 26 28  A/F
3/4" 36 45 76 58 18 26 32 49 20 29 32  A/F
1 1/4" 58 70 95 72 23 29 52 59 24 35 51  A/F
1 1/2" 64 75 95 72 23 29 61 59 24 35 55  A/F

QRC SIZE (D1) D2 D3 D4 L1 L2 L3 L4 L5 L6 L7 L8 H
1" 45 55 45 85 63 22 27 41 56 26 30 41
2" 75 85 70 113 84 30 33 69 72 30 42 66
2 1/2" 90 108 90 125 100 25 37 84 75 22 53 84
3" 110 130 110 130 105 25 37 104 75 22 53 84


Products by Material

Stainless Steel Double check valve
Perfect Engineers is one of the leading Manufacturers, Supplier of Stainless Steel Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

SS 304 Double Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of SS 304 Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

SS 304L Double Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of SS 304L Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

SS 316 Double Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of SS 316 Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

SS 316 Double Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of SS 316L Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

Monel Double  Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of MONEL Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

Duplex Double  Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of Duplex Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

Inconel Double  Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of Inconel Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

Aluminium Double  Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of Aluminium Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.

Brass Double Check Valve
Perfect Engineers is one of the leading Manufacturers, Supplier of Brass Double Check Valve. We provide superior quality products made according to Indian and international standards and specifications at offer the premium Quality to all our clients at a competitive and reasonable price.



Application of Double Check Valve

Pneumatic System
Steel Plants plays an important role as a technology in the working and performance of mechanical work. Steel Plants are alike to hydraulic systems but these systems compressed air is used in place of hydraulic fluid.

Pilot Plants
Chemical Plant is a small-scale production engineering module facility designed to research and upgrade to the full-scale production of a product. It helps in generation generate information about the performance of the system for use in design of larger facilities.

Oil Refineries
Oil Refineries plays an important role as a technology in the working and performance of mechanical work. Oil Refineries are alike to hydraulic systems but these systems compressed air is used in place of hydraulic fluid.



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