Safety valves - SAFE TC | ARI

ARI-SAFE-TC Spring-Loaded Safety Valves

ARI-SAFE-TC are direct-acting, spring-loaded threaded safety valves designed for overpressure protection of pressurized equipment. Suitable for steam, air, water, and thermal circuits with small diameters. Connections: BSP / DIN ISO 228 Part 1.

Variants 941 / 942 / 943

• 941: Closed manual lift device, closed spring cover
• 942: Open lifting lever, closed cover
• 943: Gas-tight cap, closed cover

Types 941–943 include full-lift (D/G) and standard (F) valves. Available in PN40, DN15–25, with EN-JS1049 or stainless steel 1.4408 bodies. Temperature range: -10°C to +350°C (EN-JS1049), -60°C to +400°C (1.4408).

Heating System Variants 945 / 946

Types 945 and 946 are for heating installations per DIN EN 12828. Type 945: EPDM disc with soft seal and EPDM bellows. Type 946: Metal seat disc and EPDM bellows, for low-pressure steam up to 1 bar. Both: PN40, DN15–25, -10°C to +120°C.

Standards and Sizing

Series certified to DIN EN ISO 4126-1, AD2000-A2, TRD 421 (941–943, TÜV SV 995). Types 945/946: TRD 721, TÜV SV 997. Sizing requires flow rate, medium, temperature, set pressure, and backpressure.

Selection and Installation Considerations

• Material selection based on medium and temperature
• Soft seat for reduced seat leakage
• Metal seat for higher thermal/mechanical loads
• Vertical spindle installation required
• Inlet pressure loss up to 3%
• Discharge line drainage to prevent freezing or deposits

Typical Applications

• Steam and condensate systems
• Compressed air networks
• Hot water and thermal oil circuits
• Heating installations (DIN EN 12828)