Spring Check Valve
Category: Brass & Bronze Valve
Overview
Spring-loaded check valves use a stainless steel spring to hold a poppet or disc against the seat, opening only when upstream pressure exceeds the spring cracking pressure. Unlike swing checks that rely on gravity, spring checks operate in any orientation — horizontal, vertical up, vertical down, and inclined — giving designers full flexibility in piping layout. The spring pre-load also provides faster closure with less disc travel, reducing water hammer compared to gravity-close swing checks.
Technical Specifications
| Body Material | Brass (CW617N) |
| Poppet / Disc Material | Brass / PTFE-faced poppet |
| Spring Material | SUS304 stainless steel |
| Seat Material | Brass lapped / PTFE soft seat |
| End Connection | Threaded BSP / NPT |
| Pressure Rating | PN25 |
| Cracking Pressure | 0.05 – 0.3 bar (spring-set) |
| Temperature Range | -20°C to +110°C |
| Size Range | DN8 – DN100 (1/4″ – 4″) |
| Installation | Any orientation (horizontal / vertical / inclined) |
| Standard | EN 12334 / ISO 7121 |
Applications
- Pump discharge non-return protection
- vertical pipeline backflow prevention
- compressed air and gas backflow
- HVAC hydronic and chilled water circuits
- chemical dosing line non-return
- pharmaceutical and food process backflow prevention
Key Features
- Spring-loaded — works in any installation orientation
- faster closure than swing check — reduces water hammer
- stainless steel spring for chemical compatibility
- compact inline body — minimal straight-pipe requirement
- PTFE soft seat option for bubble-tight closure
- no moving external parts — low maintenance
For technical inquiries & custom orders: supakorn@stico.co.th | Tel: 02-035-9589
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