Check valve

Swing check, tilted disc and dual plate wafer check valves for preventing backflow. Low pressure loss and reliable one-way flow control for water treatment and pumping stations.

Characteristics

Nominal Diameter:   DN50 ~ DN600
Nominal Pressure:   PN16
Work Temperature:   -10°C ~ 120°C
Applicable Media：   Water, ethylene glycol ≤50%
Body Material：   Ductile Iron QT450/ SS304 / SS316
Disc Material：   Ductile Iron / SS304
Seal Material：   EPDM / NBR
Hinge Pin：   Stainless Steel SS316
Surface Treatment：   Epoxy powder

Technical Specifications

Parameter	Specification
Design Standard	BS EN 12334 / GB/T 13932
Test Standard	BS EN 12266 / GB/T 13927
Face-to-Face	BS EN 558 / ISO 5752
Flange Standard	BS EN 1092-2 / GB/T 17241.6
Nominal Diameter	DN50 ~ DN600
Nominal Pressure	PN16
Work Temperature	-10°C ~ 120°C
Applicable Media	Water, ethylene glycol ≤50%
Body Material	Ductile Iron QT450/ SS304 / SS316
Disc Material	Ductile Iron / SS304
Seal Material	EPDM / NBR
Hinge Pin	Stainless Steel SS316
Surface Treatment	Epoxy

Key Features

Prevents backflow from downstream when pump stops, protecting pumps and pipelines
Low head loss — short face-to-face dimension reduces pressure drop
Swing type: gravity-assisted closing, no external power needed
Dual plate type: spring-assisted, faster closing, reduces water hammer
Tilted disc type: suitable for vertical installation and high-velocity flow
EPDM / NBR seating rings provide long-lasting bubble-tight shutoff
Stainless steel hinge pin and shaft for corrosion resistance
Optional external lever and weight for assisted closing
Suitable for water treatment, cooling water, irrigation and building systems

Available Models

Model	Description
Swing Check Valve (Flanged)	DN50~DN600 · Single disc · Gravity & spring close · PN16
Tilted Disc Check Valve	DN50~DN600 · 5° disc tilt · Suitable for vertical mounting
Dual Plate Wafer Check Valve	DN50~DN600 · Wafer type · Spring-loaded · Minimal water hammer
Silent Check Valve	DN50~DN300 · Axial flow disc · Near-silent closing
Check Valve with Counter Weight	DN200~DN600 · External lever & weight · Adjustable closing speed
Foot Valve (Strainer Check)	DN50~DN300 · With built-in Y-strainer · Pump suction protection