500X Relief Valve Descriptions
500X relief valve is mainly applicable to firefighting or other water supply system to prevent of the system over-pressure or keep firefighting water supply system pressure. After the fire pump closing, it can also reduce the water hammer attack. It can be also applicable to large water supply system as water hammer eliminator. And even more, there is one self-cleaning filtering net which uses the fluids self-characteristics to prevent the suspended particulate with bigger specific gravity and diameter from flowed into the control system, so that it can make sure the systemic circulation proceed without hindrance, the valve operate safely and reliably.
500X diaphragm type relief valve has smooth and reliable operating performance, high strength and long service life. Flowspec Luokai can manufacture and supply the 500X relief valve mounted on the pipeline sizes≤DN600mm.
1. FEATURES
- Convenient installation and adjustment
- Stable, safe and reliable performance
- Long service life
3. STANDARDS
- Design & manufacturing: Q/FSF-2014
- Face to face: Q/FSL-2014
- Flanged ends: GB/T 17241.6, GB/T 9113, ASME B16.1 / B16.5, DIN2532-2534, DIN2542-2544
- Inspection & testing: GB/T 13927, API 598
- Quality assurance: ISO 90001
2. TECHNICAL SPECIFICATIONS
- Nominal pressure: ANSI 125/150LB, PN1.0/PN1.6MPa/PN2.5MPa
- Size: 3/4″~24″ (DN20~DN600mm)
- Materials: cast iron (GG25, ASTM A126 B), ductile iron (GGG50, GJS500, DIN1693, BS EN1563, ASTM A536 65-45-12), carbon steel (WCB), stainless steel 304 (CF8), stainless steel 316 (CF8M), brass, bronze (C83600, C95800)
- Applicable medium: water, sewage, sea water
- Applicable temperature: 0℃~+80℃ (higher temperature is available upon request)
4. APPLICATIONS
- Water projects
- High buildings
- Water treatment industry
- Power plant
- Chemical industry
Why Choose Flowspec Luokai
45+ Years Experience
Founded in 1978, manufacturing industrial valves for over four decades with proven reliability worldwide.
Global Certifications
ISO 9001, CE/PED, WRAS, FM, UL, API approved — compliant with international quality and safety standards.
OEM Custom Solutions
Flexible design and manufacturing per your specifications — material, size, pressure, actuation tailored to project needs.
Worldwide Delivery
Exported to 5 continents — North & South America, Europe, Middle East, Southeast Asia, and Africa.
Our Service Promise
Strict Quality Control
Every valve tested to API 598, EN 12266 before shipment
Timely Global Delivery
Reliable logistics to 5 continents with secure packaging
OEM & Custom Design
Tailored material, size, pressure and actuation to your specs
Dedicated After-Sales
Technical support and service throughout product lifecycle


