Lift Check
Needs a horizontal line, or a vertical line with upward flow only. The disc rides in a guide against gravity, so orientation isn't optional.
ZPVE manufactures swing, lift, dual-plate and ball check valves from DN6 to DN3000, Class 150 to 4500. Bodies in ductile iron, carbon steel and stainless steel, with metal or resilient seats.
Each valve closes on reverse flow by line pressure, disc weight or spring assist, with no actuator and no power supply. We confirm disc type, seat material and end connection against your line conditions before we quote.
| Parameter | Range | Notes |
|---|---|---|
| Size Range | DN6 – DN3000 | Across all four valve types |
| Pressure Class | Class 150 – 4500 / 1.0 – 50 MPa | Matched to body material and design standard |
| Temperature | −196°C to 1300°C | Limited by seat material on individual models |
| Body Material | Ductile iron, carbon steel, stainless steel | Selected per medium, pressure and temperature |
| Seat & Seal | Resilient soft seat or metal-to-metal | Per service medium and temperature |
| End Connection | Flanged, butt-weld, socket-weld, threaded | Per piping specification |
| Body Coating | FBE, ≥250 microns | Fusion-bonded epoxy, inside and out, on ductile iron bodies |
| Operation | Automatic | No actuator, no power supply required |
| Testing | 100% shell & seat test | Every valve tested before it ships |
| Design & Test Standard | GB, API, ASME, ANSI, JIS, BS, DIN | Confirmed at order entry |
| Approvals | WRAS · CE · EAC · PCT | Certificates issued with every shipment |
| Warranty | 12 months | Term confirmed at contract |
Body, seat, disc, hinge and spring — what each part does, and what it's made of, on our swing, lift, dual-plate and ball check valves.
Houses the flow path and carries the pressure boundary. Cast in ductile iron, carbon steel or stainless steel to match the line.
Bolted or welded closure that gives access to the internals for maintenance without removing the valve from the line.
The sealing surface the disc closes against — machined into the body or fitted as a ring, in metal or resilient material.
The moving element — swing plate, lift disc or ball — that opens on forward flow and returns to the seat on reverse flow.
Locates and directs the disc through its travel. Swing types use a hinge arm; lift and ball types use a guide.
Fitted on dual-plate and some lift designs to accelerate closure and reduce water hammer on pump trip.
Bolts, studs and nuts holding bonnet and body together, matched in grade to the body for the design pressure.
Large-bore main lines — the disc swings fully clear of the flow path, keeping pressure drop to a minimum.
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High-pressure, small-bore lines — the guided disc stays stable at high flow velocity without fluttering.
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Space-constrained pipe runs — about half the face-to-face length of a swing check, with spring-assisted closure.
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Media with suspended solids — the ball rotates through a full cycle so solids don't lodge on one seating point.
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Get the orientation wrong, and the valve type doesn't matter — it won't seal reliably. Most field failures trace back to two things: the wrong installation orientation, or an unmanaged pressure surge when a pump stops. Both are avoidable before the valve goes in the ground.
Needs a horizontal line, or a vertical line with upward flow only. The disc rides in a guide against gravity, so orientation isn't optional.
Installs horizontal, vertical or inclined — but the medium must always flow upward through the disc. Reversed, the disc never seats.
Installs in almost any orientation, including vertical downward flow, because the spring assists closure instead of relying on gravity alone.
Keep adequate straight pipe upstream and downstream of the valve. Turbulence from a nearby elbow, pump or reducer keeps the disc from seating evenly and accelerates wear.
A pump that stops suddenly sends a pressure wave back through the line. If the disc slams shut into that surge, you get water hammer — for surge-prone lines, a spring-assisted or damped closure design closes ahead of the reverse flow, without the slam.
Usually wear on the seat or disc face, or debris in the sealing area. Check for scoring before assuming the valve needs replacing.
Almost always a worn or damaged seat — or, on swing checks, the wrong orientation letting the disc hang open.
Common with scale buildup or a bent hinge pin. On lift checks, check the guide for corrosion first.
On spring-assisted valves, a fatigued or broken spring loses its damping effect. Inspect it on the same schedule as the seat.
Not sure which failure mode you're seeing?
Send Us Your Pump Curve and Line Data
Pump station discharge — prevents backflow from damaging the pump and flooding the station when pumps stop or lose power.
Lift station discharge lines — stops sewage draining back into the wet well between pump cycles.
Fire pump discharge — holds system pressure and stops water draining back through the pump when it's not running.
Riser and booster pump outlets — keeps water from falling back down the stack and hammering the pump on shutdown.
Pump and filter station outlets — prevents backflow that would drain the line and re-prime the pump on every cycle.
Cooling water pump discharge — stops reverse flow from damaging the pump on trip and protects the header from surge.
A check valve lets flow move in one direction and closes automatically to stop reverse flow — there's no actuator and no power supply involved. It protects pumps and other equipment from backflow, and stops water hammer when a line loses pressure or a pump stops.
It depends on the type. Lift check valves need a horizontal line, or a vertical line with upward flow only — the disc rides in a guide against gravity. Swing check valves are more flexible, but the medium must always flow upward through the disc. Dual-plate wafer valves install in almost any orientation, including vertical downward flow, because the spring assists closure.
Swing check valves use a hinged disc that swings open with forward flow and shuts against the seat on reverse flow. Lift check valves use a disc that rises off the seat in a guide. Dual-plate wafer valves use two spring-loaded half discs that fold open and close quickly. Ball check valves use a guided ball that seats against reverse flow. Each installs differently — see the installation guide above for orientation by type.
Yes — check valve, non-return valve, reflux valve and NRV all refer to the same type of valve. The name that's used just depends on the region or the standard being referenced.
A pump that stops suddenly sends a pressure wave back through the line. If the disc slams shut into that surge, you get water hammer — audible knocking, and over time, seat or hinge damage. A spring-assisted or damped closure design closes ahead of the reverse flow, without the slam.
We're a manufacturer. Our ISO 9001 certificate scope covers manufacturing, not trading, and the documents that ship with your order — material certificates, test reports, coating records — trace back to specific steps on our own production line, not a supplier's paperwork we're passing along.
Payment and shipping terms are confirmed on the quotation for your order. Tell us your destination and the incoterm you need, and we'll confirm terms against it.
Yes, on our ductile iron water-service line. The body is coated inside and out with fusion-bonded epoxy to a minimum of 250 microns, and the coating is WRAS approved for contact with drinking water.
Request a quote
Send us the medium, size and pressure for your project. Our engineers reply with a valve recommendation, a datasheet and a quotation.
Prefer email or WhatsApp? lucas@zpvevlave.com · +86 182 0323 5561
ZPVEVLAVE · Industrial Valve Manufacturer
Contact ZPVEVLAVE for industrial valve enquiries, technical information, project quotations and ordersupport.
+86 18203235561
lucas@zpvevlave.com