NSW Dual Plate Check Valve – Class 150–900, Retainerless/Rubber or Metal Seat

The NSW Dual Plate Check Valve is a compact, energy-efficient non-return valve designed to prevent backflow in pipeline systems. Built in accordance with API 594 and ASME B16.10, this valve features a wafer-type body design that is available in either retainerless or retainer-equipped configurations for improved safety and pressure integrity. It offers the choice of metal or resilient rubber seat sealing and is available in a wide range of materials, including WCB, stainless steels (CF3, CF8, CF3M, CF8M), duplex grades (4A, 5A), and high-performance alloys like Monel and Inconel. The short face-to-face length and lightweight design enable easy installation and maintenance. Its dual spring-loaded disc mechanism ensures quick and stable closure to minimize water hammer and reverse flow. This valve is ideal for water, steam, oil, chemical, and corrosive media in various industrial sectors.

Specifications:

– Valve Type: Dual Plate (Wafer-Type) Check Valve
– Size Range: NPS 2" to 24"
– Pressure Class: 150, 300, 600, 900
– Body Material:
 • Cast Iron, Ductile Iron
 • Carbon Steel (ASTM A216 WCB)
 • Stainless Steel (A351 CF3, CF8, CF3M, CF8M)
 • Low Temp Carbon Steel (A352 LCB, LCC, LC2)
 • Duplex / Super Duplex (A995 4A, 5A)
 • Special Alloys (Monel, Inconel, Hastelloy)
– Disc Type: Dual spring-loaded plates
– Seat Type: Metal seated or resilient rubber seat
– Construction: Retainerless or retainer body
– End Connection:
 • Flanged RF/FF/RTJ (ASME B16.5, B16.47, MSS SP-44 for NPS 22 only)
– Face-to-Face: API 594 / ASME B16.10
– Design Standard: API 594
– Testing Standard: API 598
– Optional Standards: NACE MR-0175 / MR-0103, ISO 15848
– Inspection Methods: PMI, UT, RT, PT, MT
– Temperature Rating: As per material selection and ASME standards
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