Do You Know The Choke Valve?

Choke valve is a valve that controls fluid flow by changing the throttling section or throttling length. A one-way choke valve can be combined by connecting the choke valve and the one-way valve in parallel. The choke valve and the one-way choke valve are suitable for simple flow control valves. In the hydraulic system of the quantitative pump, the choke valve and the relief valve cooperate to form three throttle speed control systems, namely the throttle speed control of the oil inlet. system, oil return circuit throttle speed control system and bypass throttle speed control system. The choke valve has no negative flow feedback function, and cannot compensate for the speed instability caused by the load change. Generally, it is only used for occasions where the load change is not large or the speed stability is not required.

How the choke valve works

1. The choke valve is suitable for controlling the choke valve liquid by changing the cross section of the choke valve or the length of the choke valve. Combining the choke valve with this product can form a unilateral choke valve, and combining it with a double valve makes a double choke valve.

2. In the pump hydraulic transmission system of quantitative analysis, the mutual cooperation of the choke valve and the speed control valve can constitute three kinds of choke valve speed change system software, which are respectively suitable for the oil channel choke valve speed change system software, Oil return choke valve speed change system software and bypass choke valve speed change system software. Because the choke valve does not have the feedback function of the total flow, it is generally suitable for the situation where the load change is not very large.

Installation of choke valve

1. Before installation, the choke valve should be disassembled, cleaned and assembled according to the requirements of the drawings, and the sealing surface should be checked for damage. If it is disassembled and installed, it will be assembled without disassembly when leaving the factory, and it will be installed directly without disassembly at the site.

2. Before installing the choke valve, prepare the corresponding tools, close the sluice gate, and rinse the pipeline to avoid debris in the pipeline from damaging the sealing surface and causing valve leakage.

3. The valve is generally installed vertically, but can also be installed horizontally.

4. The valve should be installed on the pipeline according to the medium flow direction arrow shown on the valve body.

5. When assembling, the set screw must be aligned with the valve body groove and tightened to prevent the valve cover from loosening.

6. The upper and lower layers of the valve packing are corrugated packing, and the middle is flexible graphite packing. Tighten the nuts of the joint bolts at the packing gland before putting into operation, so as to prevent the packing from being washed away during operation and causing serious leakage. If the packing is found during operation If there is bubbling or slight leakage at the box, the nut of the joint bolt at the packing gland must be re-tightened in time until no leakage occurs.

7. When the valve is disassembled when the furnace is shut down for maintenance, the sealing surface of the valve must be inspected, re-ground, replaced with packing and gasket, and re-assembled and debugged.

8. When the valve is connected to the pipeline, it should be carried out in strict accordance with the “electrical construction regulations” or the welding specifications and welding procedures provided by the manufacturer.

Choke valve features:

1. Simple structure, easy to manufacture and maintain, and low cost.

2. The adjustment accuracy is not high and cannot be used for adjustment.

3. The sealing surface is easy to be eroded and cannot be used to cut off the medium.

4. Poor sealing.