Fisher™ Type H800 Relief Valves

H800 is a compact direct‑operated relief valve. It limits instrument supply pressure to 50 psig if the regulator fails.

Type H800 relief valve is a compact, lightweight, direct-operated relief valve. It is used primarily between a pneumatic instrument and its supply pressure regulator to limit the instrument supply pressure to 50 psig / 3,4 bar should the supply pressure regulator fail open.