PN40 Stainless steel AISI316 flanged piston check valve is a high-pressure, non-return valve designed to prevent reverse flow in demanding industrial piping systems. The piston check (or lift check) design utilizes a spring-loaded piston that lifts off the seat under forward flow and closes rapidly when flow reverses, effectively minimizing water hammer . Constructed from AISI316 stainless steel (ASTM A351 CF8M), it offers superior corrosion resistance for chemical and marine environments . The PN40 rating denotes a maximum pressure of 40 bar (580 psi), while flanged ends comply with EN 1092-1 standards . These valves are ideal for pulsating flow applications, such as reciprocating pump and compressor discharge lines
Technical Attributes & Specifications
1. **Body Material:** ASTM A351 CF8M / AISI 316 Stainless Steel.
2. **Pressure Rating:** PN40 (4.0 MPa / 580 PSI).
3. **Mechanism:** Piston-type (Lift check) with guided travel.
4. **Spring Loaded:** Internal SS316 spring for positive closure in any orientation.
5. **Connection Type:** Flanged ends according to EN 1092-1 Type B1.
6. **Design Standard:** EN 14341, DIN 3356, or ASME B16.34.
7. **Face-to-Face:** EN 558 Series 1 (DIN 3202 F1).
8. **Seating:** Metal-to-metal (Integral SS316) for high-temp durability.
9. **Piston/Disc Material:** Precision machined AISI 316 Stainless Steel.
10. **Guided Design:** Piston is guided by the body/bonnet to prevent tilting.
11. **Temperature Range:** -196°C to +450°C (depending on pressure de-rating).
12. **Bonnet Type:** Bolted bonnet for easy internal maintenance and cleaning.
13. **Gasket:** Reinforced PTFE or Spiral Wound SS316/Graphite.
14. **Flow Pattern:** Straight-through design with minimal turbulence.
15. **Installation:** Suitable for horizontal and vertical (upward) pipelines.
16. **Cracking Pressure:** Low pressure required to lift the piston from the seat.
17. **Leakage Rate:** Compliant with EN 12266-1 Rate A (Zero Leakage).
18. **Casting Method:** Investment casting for high dimensional accuracy.
19. **Surface Finish:** Acid-passivated for maximum corrosion protection.
20. **Applications:** High-pressure steam, corrosive chemicals, and nitrogen systems.
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
