Check Valves

1907 - Eurostop DZR Brass WaterMarked Spring Check Valve

Series 1907

Eurostop DZR Brass WaterMarked Spring Check Valve

Size Range: 15mm to 100mm
Temperature Range: -20°C to 130°C
Max. Pressure: 1600 kPa
Cracking Pressure: 2.5 kPa

1947 - Eurostop Stainless Steel 316 WaterMarked Spring Check Valve

Series 1947

Eurostop Stainless Steel 316 WaterMarked Spring Check Valve

Size Range: 15mm
Temperature Range: -20°C to 130°C
Max. Pressure: 2500 kPa
Cracking Pressure: 2.5 kPa

1903 - Valstop Brass Spring Check Valve Viton® Seals

Series 1903

Valstop Brass Spring Check Valve Viton® Seals

Size Range: 6mm to 100mm
Temperature Range: -20°C to 135°C
Max. Pressure: 6-15mm 4000 kPa, 20-25mm 3000 kPa, 32-50mm 2400 kPa, 65-100mm 1600 kPa
Cracking Pressure: 2.5 kPa

1904 - Valstop Brass Spring Check Valve NBR Seals

Series 1904

Valstop Brass Spring Check Valve NBR Seals

Size Range: 6mm to 100mm
Temperature Range: -20°C to 70°C
Max. Pressure: 6-15mm 4000 kPa, 20-25mm 3000 kPa, 32-50mm 2400 kPa, 65-100mm 1600 kPa
Cracking Pressure: 2.5 kPa

1909 - Europa Brass Spring Check Valve

Series 1909

Europa Brass Spring Check Valve

Size Range: 10mm to 100mm
Temperature Range: -20°C to 70°C
Max. Pressure: 10-25mm 2500 kPa, 32-50mm 1800 kPa, 65-100mm 1200 kPa
Cracking Pressure: 3 kPa

1911 - Roma Brass Spring Check Valve

Series 1911

Roma Brass Spring Check Valve

Size Range: 10mm to 50mm
Temperature Range: -15°C to 120°C
Max. Pressure: 10-25mm 2500 kPa, 32-50mm 1800 kPa
Cracking Pressure: 3 kPa

2807 - 1-Piece Stainless Steel Spring Check Valve BSP Threaded

Series 2807

1-Piece Stainless Steel Spring Check Valve BSP Threaded

Size Range: 6mm to 25mm
Temperature Range: -50°C to 420°C
Max. Pressure: 6000 PSI (41,300 kPa)
Cracking Pressure: 3 PSI

2808 - 1-Piece Stainless Steel Spring Check Valve NPT Threaded

Series 2808

1-Piece Stainless Steel Spring Check Valve NPT Threaded

Size Range: 6mm to 25mm
Temperature Range: -50°C to 420°C
Max. Pressure: 6000 PSI (41,300 kPa)
Cracking Pressure: 3 PSI

1940 - 2-Piece Stainless Steel Spring Check Valve

Series 1940

2-Piece Stainless Steel Spring Check Valve

Size Range: 6mm to 50mm
Temperature Range: -20°C to 170°C
Max. Pressure: 6300 kPa

4020 - 3-Piece Stainless Steel Spring Check Valve

Series 4020

3-Piece Stainless Steel Spring Check Valve

Size Range: 6mm to 100mm
Temperature Range: -20°C to 230°C
Max. Pressure: 5500 kPa

1802 - Zetco WaterMarked DZR Brass Swing Check Valve

Series 1802

Zetco WaterMarked DZR Brass Swing Check Valve

Size Range: 15mm to 100mm
Temperature Range: 0°C to 99°C
Max. Pressure: 1600 kPa

1805 - Bronze WaterMarked Swing Check Valve

Series 1805

Bronze WaterMarked Swing Check Valve

Size Range: 15mm to 100mm
Max. Pressure at Nominal Temp.: Steam 1050 kPa @ 186°C; Water: 2500 kPa @ 99°C

1835 - Bronze Swing Check Valve NPT Threads

Series 1835

Bronze Swing Check Valve NPT Threads

Size Range: 15mm to 80mm
Max. Pressure at Nominal Temp.: Steam 1050 kPa @ 186°C; Water: 2500 kPa @ 99°C

1808 - Bronze WaterMarked Swing Check Valve Flanged

Series 1808

Bronze WaterMarked Swing Check Valve Flanged

Size Range: 50mm to 100mm
Max. Pressure at Nominal Temp.: Steam 700 kPa @ 170°C; Water 1600 kPa @ 99°C

4050 - Stainless Steel Swing Check Valve

Series 4050

Stainless Steel Swing Check Valve

Size Range: 10mm to 80mm
Temperature Range: 0°C to 200°C
Max. Pressure: 1600 kPa

4640 & 4641 - Stainless Steel Flanged Swing Check Valve

Series 4640 & 4641

Stainless Steel Flanged Swing Check Valve

Size Range: 50mm to 200mm
Max. Temp. at Nominal Pressure: 100°F @ 275 PSI (37°C @ 1900 kPa)

1806 - Zetco Bronze WaterMarked Screwed Bonnet Lift Check

Series 1806

Zetco Bronze WaterMarked Screwed Bonnet Lift Check

Size Range: 15mm to 50mm
Max. Pressure at Nominal Temp.: Steam 1050 kPa @ 186°C; Water 2500 kPa @ 99°C

1807 - Bronze WaterMarked Union Bonnet Lift Check Stainless Steel Trim

Series 1807

Bronze WaterMarked Union Bonnet Lift Check Stainless Steel Trim

Size Range: 15mm to 80mm
Max. Pressure at Nominal Temp.: Steam 1750 kPa @ 260°C; Water 4000 kPa @ -10°C to 120°C

1809 - Zetco Bronze WaterMarked Vertical Lift Check

Series 1809

Zetco Bronze WaterMarked Vertical Lift Check

Size Range: 15mm to 50mm
Max. Pressure at Nominal Temp.: Steam 1050 kPa @ 260°C; Water 2500 kPa @ -10°C to 150°C

1558 - 5 Way Brass Tee

Series 1558

5 Way Brass Tee

Size Range: 25mm
Temperature Range: 0°C to 99°C
Max. Pressure: 2100 kPa

Zetco Check Valves

Check valves are mechanical valves that permit gases or liquids to flow in only one direction, preventing flow from reversing down the line. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve while backflow forces the check valve to close. Most check valves contain a flat disc that is slightly larger in diameter than that of the port. Flow indicators on the side of the body indicate the direction of the flow for correct installation.

Zetco has the most comprehensive range of WaterMarked check valves in Australia, being the first to develop such a range. Swing and Spring check valves are still available in non-watermarked versions in the market even though the Plumbing code (AS3500) calls for a tested WaterMarked product even in non-potable water environments. Zetco only stocks WaterMarked Spring and Swing checks for the plumbing industry, giving you confidence that you can comply with relevant legislation.

WaterMarked versions of both spring loaded and swing check valves are available in both flanged and threaded versions. Spring loaded check valves are available with seals for specific applications such as diesel and are fitted with conical jumpers to reduce flow restrictions. Spring loaded and swing check valves are available in 316 stainless steel to be utilised in aggressive applications. Flanged swing check valves are drilled to customers specifications.

Swing and Spring checks are available in threaded and flanged ends in sizes 15mm through to 100mm. Metals include DZR brass, bronze and stainless steel and are available in 1-, 2- and 3-piece versions.

Market applications include hydraulics, mining, pumps, compressed air and natural gas.

Check Valve FAQ

Check valves are mechanical valves that permit gases or liquids to flow in only one direction, preventing flow from reversing down the line. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while undesirable reverse flow forces the check valve to close. Most check valves contain a flat disc that is slightly larger in diameter than that of the port. Flow indicators on the side of the body indicate the direction of the flow for correct installation.
Spring check valves have a disc held in place by a spring, which means they and can operate in either a vertical or horizontal mounting position because they do not rely on flow pressure or direction to function. Spring check valves are available with many different types of seats, the most common being nylon, which tends to wear quickly, requiring replacement more often than more durable brass seats.
Swing check valves have a hinged disc which swings into position, and can operate in either horizontal or vertical (upward flow) positions. Movement through the line automatically swings the disc open to allow full flow, so swing check valves must be installed with normal flow opening the disc. Should reverse flow occur, the reversed pressure and the weight of the disc closes the disc back against the seat and back-flow is stopped immediately. This type of check valve offers minimal flow restriction, allowing full flow to be achieved through the valve.
Lift check valves work automatically with horizontal line pressure as the bonnet is positioned vertically above the valve, lifting up with forward flow. Like a globe valve, with its indirect line of flow, lift check valves are flow-restricting, and so are generally used as a companion to globe valves. Line pressure lifts the disc, and flow is allowed to occur. When flow reverses, the disc falls back onto its seat and immediately cuts off the flow, preventing back-flow from occurring.