What are the working principle and structural characteristics of manual reversing valve?


Manual reversing valve is also called Chris valve, is a valve, there are a number of directions adjustable channel, can timely change the flow of fluid. This manual valve is widely used in petroleum, chemical production, more often used in synthetic ammonia, natural gas manufacturing system. In addition, manual directional valves can be used as valve construction and are commonly used if smaller flow rates are available. When working, as long as the handwheel is turned, the flow of the working fluid can be changed through the valve.

What are the working principle and structural characteristics of manual reversing valve?

Manual reversing valve is mainly composed of valve, seal assembly, CAM, valve, handle and valve cover and other parts. The valve is driven by the handle, through which the valve and the rotation of the CAM are driven, and the CAM has the opening and closing functions of the position actuation and locking seal assembly. The handle rotates counterclockwise, and the two sets of sealing parts close the two channels at the lower end under the action of the CAM, and the upper two channels are communicated with the inlet of the pipe device. Instead, the upper two channels are closed and the lower two channels communicate with the inlet of the piping equipment, constantly changing direction.

(1) The valve of the manual reversing valve is divided into two holes on the baffle, each hole has three channels, the middle is the water inlet, and both ends are the exhaust port. The valve body is welded structure of carbon steel plate, small volume, light weight, compact structure, improve the material utilization, shorten the production cycle, reduce the cost. Sealing surface welding stainless steel, no rust, corrosion resistance, sealing surface polishing after polishing, surface roughness RA0.8m.

 

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(2) manual reversing valve has two sets of sealing parts. Each set of sealing assembly is composed of valve, seal, adjusting block, adjusting screw, splint and bolt. The valve is a carbon steel welded piece that enhances the strengthening material, that is, the valve strength, and acts as a guide to ensure coaxiality between the valve groups. Valve inset with oil resistance, wear resistance, stable performance, good sealing, long service life polyurethane rubber ring. Under the action of the CAM, the spherical seal ring and the valve sealing surface contact, extrusion elastic deformation, to achieve the sealing effect. The adjusting block and the adjusting screw play the role of adjusting when the two groups of sealing elements are not in place at the same time, to ensure that the sealing performance of each channel is synchronized in place.

(3) The axial seal between the valve and the valve divider and the upper valve cover uses O-rings.

(4) the valve separator and the upper valve shaft hole part is inlaid with copper sleeve, reduce the friction torque with the O-ring, can open and close the sealing component, the working torque is small.

(5) The upper valve is provided with a mark and a limit screw, and the pointer is installed on the valve to clearly indicate the connection status of each channel for easy operation.

What are the advantages of manual directional control valves?

Accurate action, high degree of automation, stable work, but need to drive and cooling system, more complex structure. Valve structure is relatively simple, mostly used in small flow production process.

In petroleum, chemical industry, mining, metallurgy and other fields, manual reversing valve is an important fluid steering equipment. The valve is installed on the line carrying the lubricating oil in the thin oil lubrication system. Convert THE RELATIVE POSITIONS OF SEAL ASSEMBLIES ON THE BODY, CONNECTING OR SEPARATING EACH VALVE CHANNEL TO CONTROL FLUID SWITCHING AND STOPPING.

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