Gas pressure relief valve HSS

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Product Overview
Hants Aseptic Safety Relief Valve (model HSS) is an angle-type, CIP/SIP-capable safety relief valve machined from solid bar stock for hygienic overpressure protection in high-purity steam, gas and liquid systems. It is intended for clean steam, air, water and other process media compatible with AISI 316L construction and is suitable for food, beverage and pharmaceutical processing.

Key Features and Benefits

• Machined from solid AISI 316L bar stock to ensure structural integrity and high-purity internal surfaces.
• Elastomer bellows fully isolate the product chamber from the spring housing to prevent contamination from the spring mechanism.
• Self-draining angle-type design eliminates dead legs and fluid entrapment for reliable CIP/SIP drainage.
• Internal wetted parts finished to ≤ 0.51 µm Ra (SF1) and ultrasonic cleaned to meet stringent sanitary requirements.
• Optional pneumatic lifting device for automated seat lifting during CIP/SIP cycles to improve cleaning effectiveness.
• Designed in accordance with DIN EN ISO 4126-1 and the Pressure Equipment Directive (PED) for certified overpressure protection.

Applications

• Overpressure protection for clean steam generators, hygienic pipelines and pressure vessels.
• Processing systems in the food, beverage and pharmaceutical industries.
• Use with clean steam, air, water and other compatible gases or liquids in sanitary process lines.

Frequently Asked Questions (FAQ)

• Q: Why is a self-draining design critical for sanitary safety valves?
  A: Self-draining geometry prevents fluid entrapment and dead legs, reducing bacterial harborage. Combined with solid-bar construction and smooth internal finish, it supports effective CIP/SIP validation in pharmaceutical and food applications.

Technical specifications

• Material: AISI 316L (1.4404)
• Disc Material: AISI 316L
• Size & Connection: Clamp ferrules (ASME BPE / DIN), ¾'' x 1'' to 1½'' x 2'' (DN20 to DN50)
• Pressure Range: 0.5–16 bar
• Surface finish (internal wetted parts): ≤ 0.51 µm Ra (SF1)
• Cleaning: Ultrasonic cleaning; CIP/SIP-capable
• Design: Self-draining angle-type; fully machined from solid bar stock
• Isolation: Elastomer bellows isolate product chamber from spring housing
• Options: Pneumatic lifting device for automated seat lifting during CIP/SIP
• Standards: DIN EN ISO 4126-1; Pressure Equipment Directive (PED)