ELECTRO-HYDRAULIC VALVES FOR STANDPIPES AND RESERVOIRS.
An electro-hydraulic valve which can be operated almost instantaneously from the pumping station makes direct pressure instantly available either for fire extinguishment or for shutting off the water instantaneously in case of a burst main or line of mains. It also reduces the cost of pumping, as the water need not always be pumped up to the extreme height at which some standpipes are built. A standpipe sixty feet high, with a valve at the base that can be operated at any moment from the pumping station, would in many instances answer the same purpose as a standpipe 140 feet high, much less dangerous is to lives and surrounding property and cost, less to put up. This thq electrohydraulic valve can effect. It is simplicity itself and has absolutely nothing about it that can get out of order. Figure 2 shows the interior of the controling device. There are two magnets; with their armature fixed on the spindle in such position that, when the electric current is going through one magnet, it attracts its armature, turning it to a position parallel with the magnetised poles and opening a three-way valve admitting the water to one end of the hydraulic cylinder. Applying the electric current to the other magnet turns its armature parallel with the magnetised poles, shifting the three-way valve admitting the water to the opposite end of the cylinder. The balanced three-way valve is of the slide-valve type, and so constructed as to assure its free working at all times. The switchboard at the pumping station has two push-buttons. one for each line connected with the magnets at the controling device. It also has three binding posts. The middle binding post connects to one end of the batteries. The other end of the battery connects with the water pipes. Two outside binding posts connect to lines running to the electric controling device. Figure 1 shows the electro-hydraulic valve of the Engberg’s Electrical and Mechanical works, St. Joseph, Mich., complete, ready for wire connections.