The Powerseat family is an electro-hydraulically operated range of gas safety shut-off valves with ultra high flow rates and a range of associated accessories. Their primary function is the on-off control of low pressure combustible gases, air and oil. They may be used for both control and safety shutoff purposes. The valves are suitable for the three families of combustible gas as follows, 1st, town gas;2nd, natural gas and 3rd, Liquefied Petroleum Gases. They are suitable for oil with a viscosity of up to 200 seconds Redwood.