Spring Loaded Check Valve
Non-slam design with spring-assisted closure for water hammer prevention.
Technical Specifications
| Type | Spring Loaded (Non-Slam) |
| Size Range | 1/2" to 24" (15 mm to 600 mm) |
| Body Materials | Carbon Steel, Stainless Steel |
| Disc Material | SS304, SS316, Duplex |
| Spring Material | SS316, Hastelloy |
| End Connections | Wafer, Flanged |
| Pressure Rating | PN10 / PN16, Class 150 / 300 |
| Standards | API 594, EN 12334 |
Applications
Pump protection, water hammer prevention, compressors
About the Spring Loaded Check Valve
The spring loaded check valve (also called a non-slam check valve) incorporates a compression spring behind the disc that pre-loads the disc toward the closed position. This spring loading means the disc begins closing as soon as forward flow velocity decreases - before flow reversal occurs - rather than waiting for the negative velocity force of reversing flow to push the disc shut as in a standard swing check. The result is that the disc arrives at the seat with nearly zero velocity (the spring has already decelerated it), producing a "soft" seat contact rather than a slamming impact. This virtually eliminates water hammer pressure transients on pump trip or compressor shutdown.
The spring loaded check valve also has the advantage of being position-independent: because the disc is spring-loaded toward the seat, the valve can be installed in any orientation - horizontal, vertical upward, vertical downward, or inclined - without risk of the disc hanging open by gravity in non-horizontal orientations. This multi-directional installation flexibility, combined with non-slam closure and compact face-to-face (wafer body versions are typically 1/3 the length of a flanged swing check), makes spring loaded check valves one of the most versatile check valve types available. Vajra Industrial Solutions supplies spring loaded check valves in wafer and flanged body styles in sizes 1/2" to 24" in Carbon Steel and Stainless Steel to API 594 and EN 12334.
Where It's Used
Key industries and applications for the Spring Loaded Check Valve
Pump protection in any pipe orientation
spring loaded check valves on pump discharge in vertical, inclined, and horizontal installations; eliminates the orientation constraint of swing checks; prevents reverse rotation of pumps on trip
Compressor anti-surge and discharge protection
SS316 spring loaded check valves on compressor discharge headers, anti-surge recycle lines, and gas lift injection; spring pre-load prevents disc flutter at pulsating flow conditions
HVAC and building services
compact wafer spring loaded check valves on chiller and boiler pump discharge, plate heat exchanger connections, and domestic hot water circulation pumps; can be installed in any position in congested plant rooms
Chemical injection and metering
SS316 or Hastelloy spring loaded check valves on chemical dosing pump outlet to prevent siphoning of chemicals back into the pump when the pump stops; Hastelloy spring for aggressive chemical compatibility
Water and wastewater treatment
Carbon Steel or SS316 spring loaded check valves on filter backwash pump discharge, raw water pump outlet, and sludge dewatering pump discharge; non-slam operation protects valves and instruments from water hammer
How to Choose the Right Spring Loaded Check Valve
Specify spring loaded check valves when: (a) the installation orientation is not horizontal and a swing check cannot be used; (b) water hammer on pump trip is a concern and a non-slam design is required; (c) the pipe size is too small for a dual plate check valve (below 2") or the fluid is too viscous for dual plate closure; or (d) the flow is pulsating (metering pumps, compressors) and the spring stiffness can be selected to prevent disc flutter. Select spring constant to suit the system - a stiffer spring improves non-slam performance but increases cracking pressure and pressure drop.
Popular Configurations
Most commonly ordered specifications for the Spring Loaded Check Valve
Frequently Asked Questions
About Spring Loaded Check Valve - ordering, specs, delivery & compliance
What standards does the Spring Loaded Check Valve comply with?+
Our Spring Loaded Check Valve complies with API 594, EN 12334. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Spring Loaded Check Valve?+
The Spring Loaded Check Valve is available in Carbon Steel, Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Spring Loaded Check Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Spring Loaded Check Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered check valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Spring Loaded Check Valve?+
The Spring Loaded Check Valve is available in pressure ratings of PN10 / PN16, Class 150 / 300. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Spring Loaded Check Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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Other Check Valves
Swing Check Valve
Traditional hinged disc design for horizontal or vertical upward flow applications.
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Dual Plate Check Valve
Compact wafer-style check valve with twin spring-loaded plates for quick closure.
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Lift Check Valve
Piston or ball type lift check for vertical flow and high-pressure applications.
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Tilting Disc Check Valve
Pivoting disc design with low cracking pressure and near-silent non-slam closure for large pipelines.
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