High pressure stainless steel in-line check valve PN320

This heavy-duty high-pressure stainless steel in-line check valve (PN320) is engineered for reliable backflow prevention in high-pressure piping systems. Featuring a robust forged stainless steel body and female threaded connections, it ensures unidirectional fluid flow, minimal pressure drop, and exceptional durability under severe working conditions up to 320 bar.

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Technical Specifications

Valve Type: In-line Spring Loaded Check Valve / Non-Return Valve
Nominal Diameter: DN50 (2 Inch)
Nominal Pressure: PN320 (32 MPa / 320 Bar / Approx. 4640 PSI)
Body Material: Stainless Steel 316 (CF8M) / 304 (CF8) / Forged SS316L
Poppet/Disc Material: Stainless Steel 316 / Stellite faced
Spring Material: Stainless Steel 316 / Inconel (for high-temperature resilience)
Seal Type: Metal-to-Metal Seal / PEEK / Viton (Depending on temperature requirement)
Connection Type: Female Threaded (NPT, BSPT, or G thread)
Flow Direction: Unidirectional (Indicated by the permanent arrow etched on body)
Cracking Pressure: 0.5 bar to 2.0 bar (Standard spring setting, customizable)
Maximum Operating Temperature: -20°C to +200°C (with soft seals) / up to +400°C (with full metal-to-metal seating)
Applicable Medium: High-pressure water, steam, hydraulic oil, oil & gas, and mild corrosive chemicals
Structure Design: Two-piece threaded body construction with high-tensile thread engagement
Flow Coefficient (Cv): High-flow efficiency design with minimized turbulence
Leakage Class: ANSI Class V (Metal seat) or Zero Leakage / Bubble Tight (Soft seat)
Shell Test Pressure: 48.0 MPa (1.5 times nominal pressure for safety validation)
Sealing Test Pressure: 35.2 MPa (Hydraulic testing standard)
Design Standards: Machined and tested in accordance with DIN 3230, ASME B16.34
Surface Finish: Fine brushed stainless steel exterior, burr-free interior finish
Features: Hexagonal or flat-slotted ends for easy wrench tightening and installation