Smith 210 series  electro-hydraulic valve is composed by a second open electromagnetic valves, a second closed electromagnetic valves, 2 only 3/8 "manual small ball valve (needle valve) and the main valve ，total  six valve, The usually open valve installed in upstream piping of control circuit , closed electromagnetic valve installed in downstream piping of the control circuit  . In the pipeline conveyance medium process, when need to open the valve, the computer send out the valve open singal, the usually open electromagnetic valve set up an electric circuit (closed), the usually closed electromagnetic valve set up an electric circuit (open). the reason is , The channel (from upstream to  the main valve piston) has been cut off, the channel (from the main valve  piston to the downstream) will be conduction. At this time, the pressure of  lower part of the piston medium is higher than the upper pressure, the chamber media of main valve piston row to downstream piping through the closed electromagnetic valve, the main valve is opened

Technical parameter

Characteristic

Stable and reliable, and the service life is more than 100000 times
Open shut speed can be adjusted, eliminate water attack
But automatic and manual control, free outfit bypass circuit
Can be installed in horizontal, vertical, application scope
Open and flexible, simple structure, easy maintenance
AC220V, DC24V power supply
Can be used in natural gas, liquefied petroleum gas, valves, chemical industry
The controller control, open and close promise, realize constant flow, filling quantity