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2013/8/3
Hydraulic control valve

Hydraulic control valve is a self -lubricating using water body, without additional oil lubrication , the main valve in case of damaged parts , please follow the instructions for disassembly . ( Note: The internal valve damage within the general consumption goods for the hydraulic control valve diaphragm and the ...
But in engineering application of hydraulic control valve, there are still some errors, such as the applicable conditions of the valve , the valve design selection requirements , installation points , etc. Therefore, this article is intended to CECS standard " hydraulic control valve application design procedures" ( submittals draft ) , combined with my experience to illustrate the various aspects of the problem .
Hydraulic control valve is a medium pressure pipeline as a driving force for opening and closing , regulating valve. It consists of a main valve and attached to the catheter , needle valves , ball valves and pressure gauges and other components, depending on the purpose, function of different places , can be turned into a remote control float valve , pressure reducing valve , relief valve closed , flow controllers , pressure relief valves , hydraulic electric control valves, emergency shut-off valve. Pilot valve with medium level and pressure changes and the action , as many types of the pilot valve , can be used alone or several in combination, can access the main valve and the water pressure and flow for adjustment function individually and composite . However, a similar valve main valve body , the valve fully open , the pressure loss is much larger than the other valve , and the loss factor of each opening and the fully closed state more closer , more surge , the greater the more the valve aperture significant.
Having the above characteristics of the valve, close the valve flap in the acceleration operation , prone to the impact of water hammer , near the fully closed, the valve operation , the slower the better, may then be set on the throttle valve . Another pilot valve orifice and the action part to try to avoid setting a special small diameter orifice to prevent clogging. Necessary to add filters, regular maintenance and setting the bypass pipe . Hydraulic control valve of diaphragm and piston -type categories , working on the same principle , are the upstream and downstream pressure difference as the driving force , with pilot valve controls the diaphragm ( piston ) hydraulic differential operation , fully automatic adjustment by the water , so that the main valve valve fully open or fully closed or is in regulation.
When entering the separator ( piston ) above the pressure control chamber downstream of the water is discharged to the atmosphere or low pressure area , the role of the diaphragm valve portion and the bottom of the low pressure value is greater than the upper pressure value , so as to push the main valve disc to a fully open position: when entering the separator ( piston ) above the pressure control chamber in the middle since the inlet pressure and outlet , the main valve disc is in the modified state of the duct system, adjust the position depending on the pilot valve needle and the joint control action .

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