Screwed Spring Check Valve

Product Name & Standards Screwed Spring Check ValveCompliant with API 594, ASME B16.34, and ANSI B16.11 standards. Core Definition A specialized one-way flow control valve designed to prevent reverse flow in piping systems, featuring a cylindrical body and a spring-loaded disc. The disc opens automatically to allow one-way fluid flow when media pressure overcomes the spring force, and closes instantly when flow reverses-driven by the spring’s restoring force. Optimized for low-pressure applications, it is commonly used in systems such as fire sprinkler networks, delivering reliable backflow prevention in compact configurations. Structure & Working Principle – Key Components: Threaded cylindrical valve body, spring-loaded disc (sealing element), compression spring, valve seat, and flow guide structure. – Operating Mechanism: When fluid flows in the intended direction, its pressure pushes the spring-loaded disc upward, compressing the spring and opening the flow path; upon reverse flow, the spring expands to push the disc tightly against the valve seat, blocking backflow immediately. The spring ensures rapid, consistent closure even in low-pressure or vertical installation scenarios. – Connection Method: Screwed (NPT/BSPP) ends for secure, leak-tight integration with threaded pipelines, enabling easy on-site installation and maintenance without complex tools. Performance Advantages – Reliable low-pressure adaptation: Spring-loaded design ensures effective operation in low-pressure systems, where gravity-driven check valves may fail to seal properly. – Rapid closure: Spring force enables instant disc seating upon reverse flow, minimizing water hammer and backflow-related damage. – Flexible installation: Compact cylindrical design supports both horizontal and vertical (fluid upward flow) mounting, adapting to diverse piping layouts. – Compact & cost-effective: Streamlined structure saves space and reduces procurement costs, ideal for large-scale low-pressure systems (e.g., fire sprinklers). – Durable sealing: Precision-machined disc and valve seat, combined with spring preload, ensure consistent leak-proof performance in long-term operation. Key Specifications – Pressure Rating: PN10 – PN16 / Class 150 (optimized for low-pressure applications). – Operating Temperature: -29℃ – 200℃ (carbon steel/stainless steel body) / -10℃ – 120℃ (brass body). – Body Materials: Carbon Steel (A105), Stainless Steel (304L/316L), Brass (ASTM B16). – Disc Material: Stainless Steel (304L/316L), Brass (for low-pressure compatibility), PTFE-coated steel (enhanced sealing). – Spring Material: Stainless Steel 304/316 (corrosion-resistant for long-term elasticity). – Sealing Material: PTFE (Polytetrafluoroethylene), Nitrile Rubber (NBR) – suitable for water, gas, and general fluids. – Connection Type: Screwed (NPT/BSPP) – compatible with standard threaded pipelines. – Size Range: 1/4″ – 2″ (common threaded sizes for low-pressure flow control). Application Fields – Fire Protection Systems: Fire sprinkler networks, fire hydrant auxiliary lines, and low-pressure fire suppression pipelines. – Residential & Commercial Plumbing: Home water supply lines, commercial building low-pressure piping, and HVAC condensate return systems. – Industrial Low-Pressure Systems: Chemical processing low-pressure lines, water treatment auxiliary pipelines, and compressed air distribution branches. – Specialized Scenarios: Low-pressure fluid circuits, vertical piping installations, and systems requiring compact, rapid-acting backflow prevention (e.g., small-scale irrigation, beverage processing lines).