초록 ▼

An installation control valve preferably for use in a fire fighting installation has a pivotal valve disc with an axis spindle to which is connected a lever. A lever retaining mechanism co-operates with the lever and is releasably held to resist lever and so valve disc movement. An actuating means i

An installation control valve preferably for use in a fire fighting installation has a pivotal valve disc with an axis spindle to which is connected a lever. A lever retaining mechanism co-operates with the lever and is releasably held to resist lever and so valve disc movement. An actuating means is operable under predetermined condition to release the lever retaining mechanism to permit lever and valve disc movement to effect valve opening.

대표청구항 ▼

A fire extinguishing installation control valve comprising: (i) a valve body for disposition in an installation pipework downstream of a pressurized source of extinguishant; (ii) a pivotal butterfly valve disc within the valve body and normally retained closed to prevent flow of extinguishant throug

A fire extinguishing installation control valve comprising: (i) a valve body for disposition in an installation pipework downstream of a pressurized source of extinguishant; (ii) a pivotal butterfly valve disc within the valve body and normally retained closed to prevent flow of extinguishant through the installation pipework; (iii) a sealing ring cooperable with a periphery of the valve disc and the valve body and effective with pressure on at least one side of the closed valve disc; (iv) a rotatable spindle pivotally mounting the valve disc within the valve body with an end thereof extending outside the valve body, which spindle is offset both radially and longitudinally of the point of intersection of a plane in which the periphery of the valve disc lies and the axis of the disc normal to said plane; (v) a lever connected to said end of the spindle; (vi) a retaining mechanism cooperable with the lever to resist movement thereof to maintain the valve disc closed against unequal pressure forces acting on either side thereof; and (vii) actuating means operable under a predetermined condition actuating said retaining mechanism to move and separate from said lever for movement to permit said unequal pressure forces to open the valve disc for free movement and allow extinguishant flow through the installation pipework.