300X Slow Closing Check Valve Descriptions
300X slow closing check valve is one type of intelligent valve which is applicable to pump outlet of the high buildings water supply system and other water supply system to prevent of fluids back flow and water hammer. The valve combines three functions, including electric valve, non-return valve and water hammer eliminator, so it can improve effectively the water supply system safety and reliability. 300X diaphragm type slow close check valve integrates slow opening, slow closing and water hammer eliminating technical principles to prevent of pump start water hammer and pump stop water hammer. Just only needing operate the pump motor open and close button to achieve automatically the valve open and close according to the pump operating instructions. It has big flow but less pressure loss.
Flowspec Luokai can manufacture and supply the 300X slow closing check 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


