Quality is everything! US Walker (WORK) imported double coil self-holding solenoid valve actuators were used to open the valve and closed two control devices, converting components using rare earth permanent magnet materials, coil instantaneous power that is self-locking and power to maintain the valve position, at the same time with normally open and normally closed two control functions. Is widely used in hydroelectric power station cooling water systems unit, furnace gas control system and the need for a long period of self-control solenoid valve system normally open or normally closed state, the fluid in the pipeline for fast switching and remote control. Significant energy saving effect, known as "no power solenoid valve." How it works: the initial state of the solenoid valve is closed, the media can not flow. Click to open the switch, that is the top of the coil switch, the top coil is energized, the valve stem to drive the piston rises, the valve opens, the media can be in circulation. Click off switch, that side of the coil switch, side coil is energized, the valve stem to drive the piston down, the valve is closed, the media can be turned off. The main features of a product both normally closed and normally open two control modes, instant power can be converted valve position, but without the power consumption of electricity, completely solve the conventional products under long-term power state coil temperature rise is easily burned technical problems. 2, the operative part of this product uses magnets to keep self-locking structure, a switching valve memory function. 3, the product according to user needs to install the switch valve lights display, the remote signal output, manually operated institutions. 4, polarity switching components using the most advanced military-grade rare earth permanent magnet materials, magnetic, high reliability, anti-jamming features. When ordering, please provide the following information:? A nominal diameter (mm), nominal pressure (MPa), operating temperature range of two straight and before the pressure regulating valve, the valve pressure of 3 media name and status at 4 single seat??? valve supply voltage (220V or 380V, default 220V) 5 Input signal:??? 4-20mA, or 1-5V (default 4-20mA) 6 single-seat control valve body, the trim material requirements seven other special requirements (eg corrosion requirements, proof grade requirements, leakage class limits, etc.) USA Walker (WORK) Valves Chinese agents welcome your inquire and order!