The H721 and H731 Series relief valves are installed in tanks, both stationary and mobile, as a means of preventing excessive overpressure. These units are used primarily in trucks transporting LP-Gas (Propane) or ammonia. The stainless steel construction increases resistance to rust and corrosion, and makes it easy to remove the valve from the tank for the required periodic testing.

The complete valve is secure inside the tank with only the nameplate extending above the coupling. A special installation wrench can be inserted into the valve socket to provide a means of attaching a standard wrench.

The H280 Series Internal Spring Valves can be used in the Combo JoeŽ relief valve manifold or as separate units on stationary tanks. When used in ASME tanks, these units have only the poppet and most of the body outside the tank. To prevent tampering, the adjusting screw and all other parts are inside the tank.

The drain deflector is furnished as standard on the H280 Series valve; a 3-inch FNPT coupling is also available for attaching a stand pipe.

The H5110 Series internal spring valves can be used in the Combo JoeŽ relief valve manifold or as separate units on stationary tanks. When used in ASME tanks, these units have only the poppet and most of the body outside the tank. To prevent tampering, the adjusting screw and all other parts are inside the tank.

The H5110 Series valves are constructed of steel to allow for either ammonia or LP-Gas (propane) service. The drain deflector is furnished as standard on the H5110 Series valves; a 3-inch FNPT coupling is also available for attaching a stand pipe.

The H500 Series Combo JoeŽ relief valve manifold contains four standard style relief valves (either the H280 or H5110 Series) suitable for stationary storage tanks up to 30,000 gallons (113 563 liters). Any one of the four relief valves can be removed for inspection or maintenance without product evacuation of the tank.

Two handles open and close the manifold ports. The handle direction points to the closed port (relief valve). A built-in bleed in the port shutoff mechanism permits a closed port to be quickly reopened.

The H500 Series manifold is available with either brass or steel trim for LP-Gas (Propane) or ammonia service.

The 98H Series are direct-operated relief valves for use on relief and backpressure applications involving large liquid propane pumping systems and vaporizers. Internal pressure registration eliminates the need for a control line.

The 289H Series is a 2-inch spring-loaded relief valve for a relief pressure range of 7-inches w.c. to 10 psig (17 mbar to 0,69 bar).

This unit features a pitot tube booster to achieve the highest possible relief capacity with a minimum buildup of system pressure.

The 289H Series is installed between large Second-Stage regulators (such as the S202G or S302G Series) and the burner to provide high capacity relief. The large diaphragm in these valves gives extremely sensitive operation.

The 1805 Series are diaphragm relief valves that protect piping downstream of a regulator from excessive pressure. It is usually installed between a First and Second-Stage regulator or in the downstream line from a high-pressure regulator used for Final-Stage service. Its internal parts can be removed without taking the body out of the line.

Relief pressures range from 5 to 125 psi
(0,34 to 8,6 bar). Maximum pressure including buildup is 150 psi (10,3 bar).