Albania Algeria Andorra Argentina Australia Austria Bahrain Belarus Belgium Bolivia Bosnia & Herzegovina Brazil Brunei Bulgaria Cameroon Canada Chile China Colombia Costa Rica Croatia Cyprus Czechia Denmark Ecuador Egypt Estonia Finland France Georgia Germany Gibraltar Greece Grenada Hong Kong SAR China Hungary Iceland India Indonesia Ireland Israel Italy Japan Jordan Kazakhstan Latvia Liechtenstein Lithuania Luxembourg Madagascar Malaysia Malta Mexico Moldova Monaco Montenegro Morocco Namibia Netherlands New Zealand Nicaragua Nigeria Norway Oman Pakistan Panama Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Romania Saudi Arabia Serbia Singapore Slovakia Slovenia South Africa South Korea Spain Sri Lanka Sweden Switzerland Taiwan Thailand Tunisia Türkiye Ukraine United Arab Emirates United Kingdom United States Uruguay Venezuela Vietnam

Brands Unlock Free AI Search

High-Pressure Safety Relief Valves | 946H5 / 956H5

When handling hydrogen at pressures up to 1100 bar, you need a valve that seals tightly every time to preserve your gas supply.

The 956H5 is an enclosed discharge valve, ensuring that all relieved gas is contained and directed through the outlet. It achieves this with a simple, three-moving-part design built to reseal and withstand hydrogen embrittlement.

This straightforward construction makes maintenance quick and easy, avoiding the need for complex, time-consuming strip-downs.

While these valves are rated for gaseous hydrogen up to 1100 bar, they are also suitable for liquid hydrogen applications. However, since pressure limit requirements change at cryogenic temperatures, please get in touch with us for detailed pressure ratings for liquid hydrogen use.

Key features

Compact and space saving design

Designed and built for repeatable operation

Advanced sealing technology with super-lapped hard-faced seat and disc, designed to offer robust high-performance sealing

Orientable gas-tight packed lever option (9*6H5 only)

Simple and robust design with three moving parts

Maintenance friendly design

Designed with Hydrogen embrittlement resistant materials (H2 option)

Product Specifications

Inlet Connections

½” NPT, BSP & BSPT
9/16” Cone & Thread
3/4” Cone & Thread

Outlet Connections

½” NPT & BSP
¾” NPT & BSP
1” NPT & BSP

Temperature Range

Type 94605 and 946H5 = 0° to 250°C
Type 95605 and 956H5 (H2 option) = -196°C to 250°C

Temperature Range (Special Options)

High temperature option, up to 300°C, available upon request
-269°C version (up to 300 bar) available upon request

Pressure Range

35.0 to 515 bar (9*605)
35.0 to 1100 bar (9*6H5)
*Maximum set pressure for steam is 85 bar

High-Pressure Safety Relief Valves 946H5/956H5