CRANE CHEMPHARMA & ENERGY · CHECK VALVES
Crane Duo-Chek High Performance Non-Slam Check Valves
Crane Duo-Chek wafer check valves - non-slam dual plate design for refineries, power plants & pipelines. Sizes 2" to 72", Class 125-2500.
Overview
The Crane Duo-Chek is a high performance non-slam check valve featuring a dual-plate wafer design. Originally introduced as the Mission wafer check valve in the late 1950s, this valve has become an industry standard for applications requiring reliable backflow prevention with minimal water hammer effects.
The Duo-Chek operates using two spring-loaded plates (disc halves) suspended on a central vertical hinge pin. As flow begins, the plates open in response to resultant force, with the heel opening first to prevent seal surface rubbing. During closure, independent spring action moves the plates closer to the body seats as flow velocity decreases, dramatically reducing water hammer. The toe of the plates closes first, preventing heel dragging and maintaining seal integrity over extended service periods.
Compared to conventional swing check valves, the Duo-Chek wafer design is approximately one-fourth the face-to-face dimension and 15-20% of the weight in popular sizes. This compact configuration requires only one set of flange studs, reducing installation costs and simplifying maintenance.
Key Features
- Dual plate flat seat design – Heel lifts first to prevent seat wear; provides bubble-tight shutoff with resilient seats
- Independent spring action – Maximum deflection of 140° (versus 350° for conventional springs) improves valve response and extends service life
- Independent plate suspension – Unique hinge design reduces friction forces by 66% for faster valve response
- Non-slam performance – Up to 25% improvement in valve life and 50% reduction in water hammer (sizes 6" and larger)
- Retainerless design available – Eliminates body penetrations for critical service applications involving hazardous materials
- Lightweight wafer construction – 10-20% weight of flanged swing checks in popular sizes
- Flexible installation – Suitable for horizontal or vertical-up positions depending on size
Specifications
| Parameter | Value |
|---|---|
| Sizes | 2" to 72" |
| ASME Pressure Classes | 125 through 2500 |
| Additional Standards | API 6A, API 6D, DIN, JIS, BS, AS, ISO |
| Body Styles | Wafer, Lug, Double Flanged, Extended Body |
| Body Materials | Cast Iron, WCB Cast Steel, 316 Stainless Steel, All Alloys |
| Resilient Seat Materials | EPDM, Buna-N, Neoprene, Refrigeration-grade Elastomer, Viton |
| Metal Seats | Integral and overlaid options available |
| End Connections | Raised Face, Plain Face, Ring Joint, Weld-End, Hub-End |
| Design Standards | API 594 (Valve Design), API 598 (Testing & Inspection), ASME B16.5 & B16.47 (Flanges), ASME B16.34 (P/T Ratings), API 6D (Pipeline), API 6A (Production), PED 97/23/EC |
| Special Certifications | NSF-61, UL Listed (select models) |
Applications
Crane Duo-Chek valves are suitable for a wide range of liquid and gas fluid applications across multiple industries:
- Petroleum Refining – Hydrogen, cracking units, crude oil, gasoline, visbreakers, naptha, sulfur, steam systems - Oil & Gas Production – Centrifugal compressor discharge, fire water lines, oil/steam separation, steam and CO₂ injection, gas/oil gathering systems, flowlines, wellheads - Petrochemicals – Ethylene, propylene, steam, reboilers, process gases - Chemicals – Chlorine, phosgene, aromatics, polymers, acids, air separation, caustics - Power Generation – Steam, condensate, boiler feed pumps, cooling towers, service water recirculators, river water intake - Steel/Primary Metals – Quench lines, de-scaling, continuous casters, strippers, electro-galvanizing - Marine – Oil tankers, tanker loading terminals, offshore platforms, sub-sea manifolds, terminal transfer lines - Water & Wastewater – Distribution lines, pumping stations, sewage plant blower discharge, fire protection, HVAC systems - Pulp & Paper – Bleaching lines, black liquor processing
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