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Standard for hydraulic control valves

 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

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.

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