Unloading valve

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Unloading valve

The proportional relief valve (also known as a proportional pressure relief valve) is an overpressure protection component designed specifically for instrumentation fluid systems. Featuring a valve body machined from a single forged piece of 316L stainless steel, it utilizes a spring-to-spool force balance mechanism to achieve proportional, gradual pressure relief. As system pressure approaches the set point, the valve opens progressively to vent excess media; it automatically closes and resets once the pressure returns to a safe range. Unlike traditional safety valves—which suffer from high-impact, instantaneous full opening—this valve effectively absorbs pressure pulses and water hammer, protecting downstream components such as pressure-reducing valves, pressure gauges, transmitters, MFCs, and piping/fittings from overpressure damage. It is compatible with both gas and liquid media and supports threaded and compression fitting connections, with VCR connection options available for high-purity applications.

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Ningbo Keshengli Stainless Steel Valve Co., Ltd.
Ningbo Keshengli Stainless Steel Valve Co., Ltd.

It is Unloading valve Suppliers and Unloading valve Factory.Our company specializes in the manufacturing and sales of stainless steel pipe fittings and valves in national (GB), American (ANSI/ASME), and British (BS) standards. We are equipped with advanced CNC machining centers, material testing and heat treatment facilities, a skilled technical team, and a robust production workforce. With a sound quality management system and excellent after-sales service, we sincerely serve customers worldwide.

Our main products include: ferrule-type fittings, threaded fittings, instrument fittings, instrument needle valves, instrument ball valves, ferrule needle valves, ferrule ball valves, compact high-pressure instrument needle valves, compact high-pressure instrument ball valves, and high-pressure check valves. The primary material is SS316 stainless steel. These products are widely used in petrochemical, petroleum, electric power, pharmaceutical, food, papermaking, marine, and general machinery industries.

We strictly control product quality at every stage and are committed to delivering superior quality through advanced technology and professional management. Adhering to the business philosophy of "Quality First, Customer Supreme, Integrity Foremost," we strive to build the "NB-KSL" brand image, better serve our customers, and work together with you to create a prosperous future.

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