High Pressure High Lift Safety Valve for Rapid Overpressure Protection in Boilers and Critical High-Pressure Systems

Hants high lift safety valve (model HST) is a type of safety relief valve designed to have a higher discharge capacity than ordinary lift valves, allowing for a quicker and sharper opening and closing. It achieves this by using the system's steam pressure to provide additional lifting force to the valve disc, often with the help of a piston-like mechanism on the spindle that is acted upon by escaping steam.

This design is used to protect systems like modern boilers from overpressure by releasing excess pressure rapidly, meeting the high relieving capacity requirements of these systems.

Hants is a sub-brand of us. As a professional manufacturer of high pressure high lift safety valve and replacement parts, supplying reliable fire protection solutions for various industries.

Application of High Pressure High Lift Safety Valve

• High-Pressure Steam Systems: Power plant boilers, superheaters and reheaters, and main steam pipelines. High lift ensures quick and full steam discharge.
• High-Pressure Gas Systems: Gas compressors and discharge lines, gas storage vessels, and high-pressure gas transmission pipelines.
• Pressure Vessels & Reactors: High-pressure reactors, autoclaves, and various process pressure vessels requiring dependable pressure relief.
• Oil & Gas Industry: Gas processing units, refinery high-pressure process lines, and both offshore and onshore production facilities
• Petrochemical & Chemical Plants: Hydrogen and synthesis gas services, polymerization and cracking units, and high-pressure chemical processing lines.
• Power Generation: Thermal power plants, combined-cycle power plants, and high-pressure auxiliary systems.

Key Features and Benefits of High Pressure High Lift Safety Relief Valve

• High Lift Design: A large disc lift provides maximum discharge capacity with rapid full opening during overpressure conditions, effectively minimizing pressure accumulation within the system.
• High Pressure Rating: Engineered for severe high-pressure service, the valve safely withstands extreme operating conditions and is suitable for steam, gas, and various process fluids.
• Robust Construction: Featuring a heavy-duty body and internal components, the valve is available in carbon steel, stainless steel, or alloy steel, ensuring long service life under cyclic loading.
• Fast Response and Stable Operation: A quick-acting mechanism enables immediate pressure relief while preventing chatter and vibration, even under high-pressure conditions.
• Safety Relief Function: Designed for both gas/vapor and liquid service, the valve opens automatically during overpressure events and reliably reseats once normal operating pressure is restored.
• Accurate Set Pressure: Provides precise and repeatable opening pressure, delivering consistent and dependable performance over multiple operating cycles.
• Tight Shut-Off and Reliable Reseating: Minimizes leakage after pressure relief, maintaining system integrity and operational efficiency.
• Standards Compliance: Designed and tested in accordance with ASME Section I / VIII, API, IS, and DIN standards.

Frequently Asked Questions (FAQ) about High Pressure High Lift Safety Relief Valve?

Q: What is the difference between High Lift Safety Relief Valve and Low (Restricted) Lift Safety Relief Valve?

A Low (Restricted) lift PRV is a pressure relief valve in which the actual discharge area is determined by the position of the disc. In a lift-type valve, the flow passage area becomes smallest at the point where the valve disc opens , creating a flow restriction.

And Full lift PRV is a pressure relief valve in which the actual discharge area is not determined by the position of the disc. Normally, at same inlet size high lift safety relief valve will have better relief flow rate than low lift safety relief valve.

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