Stainless Steel Swing Check Valve-CTV Valve Technology Co., Ltd.

Details description

Core Design & Working Principle

Basic Swing Structure: The valve disc swings around a hinge pin. Forward flow pressure lifts the disc for unobstructed passage, while reverse flow and gravity trigger closure.
Two - stage Slow - Closing Mechanism (Key Feature):

Fast - closing stage: The disc shuts 80% - 90% of the stroke rapidly (≤5 seconds) to block most backflow.
Slow - closing finishing stage: The remaining 10% - 20% stroke is damped by a hydraulic cylinder or spring buffer, with an adjustable closing time of 5-30 seconds, reducing water hammer peaks by 60% - 80%.

Auxiliary Buffer System: An auxiliary piston - cylinder unit on the disc controls fluid discharge during closure, ensuring smooth and controlled movement without impact.

Key Features & Performance

Feature	Details
Corrosion Resistance	304/316/316L stainless steel body; seals made of PTFE, graphite, or Viton for compatibility with acids, alkalis, and high - temp media (up to 525°C)
Flow Efficiency	Streamlined Venturi - style flow path minimizes pressure loss (15% - 20% lower than traditional models)
Sealing Reliability	Metal - to - metal hard seal (stainless steel + tungsten carbide) plus elastomer soft seal; leakage rate ≤0.01% of rated flow (API 598 Class IV)
Water Hammer Mitigation	Slow - closing mechanism drastically reduces pressure surges to protect pumps, pipes, and fittings
Easy Maintenance	Internal rocker arm design; no external penetration; replaceable seals and buffer components

Technical Specifications (Typical)

Parameter	Range
Nominal Diameter	DN15 - DN1200 (NPS ? - 48)
Pressure Rating	PN1.0 - PN42.0 MPa (Class 150-2500)
Temperature Range	-40°C to 525°C (depending on material and seal selection)
Slow - closing Time	5-30 seconds (field - adjustable)
Connection Types	Flange (RF/RTJ), threaded, welded (BW)
Test Standard	API 598, ISO 5208 (leakage and pressure tests)

Applications

It is widely used in water supply and drainage systems, HVAC circulation loops, chemical processing plants, power plant cooling systems, oil and gas pipelines, and wastewater treatment facilities—especially in systems with large flow rates, high pressure, or strict water hammer control requirements.

Material & Quality Assurance

Body: Cast or forged 304/316/316L stainless steel (ASTM A351 CF8/CF8M).
Disc & Seat: Hardfaced with Stellite 6 or tungsten carbide for wear resistance.
Buffer Components: Stainless steel piston, nitrile rubber seals, and corrosion - resistant springs.
Quality Control: 100% pressure testing (shell and seat) before delivery; compliance with CE, API, and ISO standards.

The stainless steel swing check valve with slow-closing mechanism is a premium automatic one-way flow control valve designed to prevent media backflow and mitigate water hammer in industrial pipelines. It integrates the reliable swing - type operation of conventional swing check valves with a hydraulic or spring - actuated slow - closing system, making it ideal for high - demand applications involving clean fluids, corrosive media, or systems sensitive to pressure surges. Its standard material grades are 304/316/316L stainless steel, which ensure excellent corrosion resistance and mechanical strength.

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