Standard for hydraulic control valves

Hydraulic control valve is an important part of water conservancy engineering  needs, related to the quality and safety of the project, hydraulic control valve  is the pipeline itself medium pressure as a power source, open and close,  regulation, the leading valve and system small pipeline different combination,  can have nearly 30 kinds of functions, now gradually get more universal use.

Pilot valves rely on as the control object of the water level and pressure  changes and action, because the pilot valve type is many, can be used alone or  several combination, can make the main valve to achieve the water level and  water pressure and flow, such as the function of separate or compound  adjustment. However, the main valve is similar to the globe valve, when the  valve is fully open, its pressure loss is much larger than other valves, and the  closer the loss coefficient of each opening degree is to the full close, the  greater the increase, the larger the valve diameter is more significant.

The valve with the above characteristics, in close to full closure, the  action of the disc is accelerated, easy to send the water hammer (water impact  pressure), close to full closure, the valve action is slower, the better, so can  set throttle mechanism on the disc. In addition, the pilot valve throttling and  action part should try to avoid setting special small aperture, so as not to  block. If necessary, add filter screen, periodical maintenance and set up bypass  pipeline. This kind of valve is promising for development and use.

Hydraulic control valve is water pressure control valve, it consists of a  main valve and its attached pipe, pilot valve, needle valve, Stainless Steel Ball Valve and  pressure gauge.

Use of hydraulic control valves, the first to pay attention to the selection.  Improper selection will cause water and air leakage phenomenon. When selecting  hydraulic control valve, the displacement of hydraulic control valve must be  selected by multiplying the equipment's steam consumption per hour by 2-3 times  the maximum condensation water. In order to ensure that the hydraulic control  valve can discharge condensate as soon as possible when driving, rapidly  increase the temperature of heating equipment. Hydraulic control valve discharge  energy is not enough, will cause condensate can not be discharged in time,  reduce the thermal efficiency of heating equipment.

GOST Gate Valve

When choosing hydraulic control valve, hydraulic control valve cannot be  selected with nominal pressure, because nominal pressure can only mean hydraulic  control valve shell to bear the pressure class, hydraulic control valve nominal  pressure and working pressure is very different. So according to the working  pressure difference to choose the hydraulic control valve displacement. Working  pressure difference refers to the difference between working pressure before  hydraulic control valve and back pressure at the outlet of hydraulic control  valve.

The choice of hydraulic control valve requires accurate steam drainage  resistance, high sensitivity, can improve the utilization rate of steam, no  leakage of steam, reliable performance, high back pressure rate, long service  life, easy maintenance is the preferred condition.

Hydraulic control valve is a use of water self-embellish valve body, without  adding oil lubrication, such as the main valve parts damaged, please according  to the following instructions for disassembly. (note: the commonly consumed  damaged products in the inner valve are diaphragm and type ring, and few other  internal parts are damaged)

1. First close the Stainless Steel Gate Valve at the front and rear ends of the main  valve.

2. Loosen the coupling screw on the main valve cover to release the pressure  in the valve.

3. Remove all screws, including nuts for necessary copper pipes in the  control line.

4. Remove bonnet and spring. 5. Remove the shaft core, diaphragm, piston,  etc. Do not damage the diaphragm.

6. After taking out the above items, check whether the diaphragm and type  ring are damaged; If there is no damage, do not fight for the internal parts by  yourself.

7. If damage is found to the diaphragm or the molded coil, loosen the nut on  the shaft core, decompose the diaphragm or the molded coil step by step, remove  and replace it with a new diaphragm or the molded coil.

8. Inspect the inner valve seat and shaft in detail to see if there is any  damage. If there is any other debris inside the main valve, clear it out.

9. Assemble the replaced parts and components in the reverse order and  install the main valve. Note that the valve should not be stuck.