Abstract: An arrangement which connects a pair of valve mounting manifold blocks in end-to-end abutment includes each block having an opening in oneend thereof, the respective end openings in the pair of blocks being in registry with one another when the respective ends of the pair of blocks are aligned and abut one another. A fastener extends from the opening in one block into the opening in the other block, and the opposite ends of the fastener are respectively fixed to the blocks such that the fastener is contained substantially entirely within the blocks. The openings may be defined by slots in the bottom of each block and the fastener may be a screw extending within the slots in threaded engagement with a nut.

Abstract: In order to provide intrinsically safe operation of an electromagnetically operated device, such as a pneumatic or hydraulic valve, a circuit in accordance with the invention includes electrical energy storage means, such as a capacitor, which is charged from a source at an intrinsically safe energy level and is subsequently at least partially discharged via switching means through an operating coil of the electromagnetic device. The capacitor is preferably charged from an intrinsically safe d.c. supply via a diode which inhibits discharging of the capacitor back into the d.c. supply. The switching means preferably operates to connect the capacitor to the operating coil when the charge on the capacitor reaches a predetermined level, as determined by a voltage sensitive device which responds to the capacitor voltage.

Abstract: An all ports in body, solenoid operated valve assembly includes a valve body and a valve operator mounted on the body with an electromagnetic core featuring a center leg projecting axially beyond the solenoid coil. A plunger and seal assembly is mounted for reciprocation along a path of movement aligned with the core center leg. The plunger and seal assembly is remotely located from the coil and all flow passages are formed in the assembly such that fluid flow through the center of the coil is excluded to minimize heat transfer to the confined fluid being controlled when the valve is electrically energized and to prolong the orifice seal life of the assembly.