Double-oil seal speed regulating valve

Abstract

The invention discloses a double-oil seal speed regulating valve. The double-oil seal speed regulating valve comprises a valve body; an oil outlet pipe fixing seat is mounted at one end of the valve body; an oil outlet pipe is fixed to the oil outlet pipe fixing seat; an oil inlet pipe fixing seat is mounted at the other end of the valve body; an oil inlet pipe is mounted in the oil inlet pipe fixing seat; two fixing holes are formed in the side wall of the valve body; the two fixing holes are symmetrical about the geometric center of the valve body; and a valve cover is mounted at the top ofthe valve body. According to the double-oil seal speed regulating valve, the rotating direction of first screw threads is the same as that of third screw threads and fourth screw threads, and the rotating direction of second screw threads is opposite to that of the first screw threads, the third screw threads and the fourth screw threads, namely, when a first oil seal fixing seat extrudes a firstoil seal downwards, the interval between the first oil seal fixing seat and the oil seal supporting seat is shortened, so that the first oil seal deforms under pressure, then the first oil seal is tightly bonded to the interior of a valve cavity, and then a liquid in the speed regulating valve is prevented from leaking from the interval between the valve rod and the valve body.

Description

technical field [0001] The invention relates to the technical field of speed regulating valves, in particular to a speed regulating valve with double oil seals. Background technique [0002] The speed regulating valve is a combined valve composed of a differential pressure reducing valve and a throttle valve connected in series. The throttle valve is used to adjust the passing flow, and the fixed difference pressure reducing valve automatically compensates the influence of load changes, so that the pressure difference before and after the throttle valve is a constant value, eliminating the influence of load changes on the flow. The pressure before and after the throttle valve is led to the right and left ends of the pressure reducing valve core respectively. When the load pressure increases, the hydraulic pressure acting on the left end of the pressure reducing valve core increases, the valve core moves to the right, and the pressure reducing port Increase, the pressure dro...

AI Technical Summary

Problems solved by technology

[0003] When the speed control valve is working, it needs to rotate the valve stem to adjust the flow of the liquid. However, the current speed control valve generally uses an oil seal to adjust the seal between the valve stem and the valve body. The contact is relatively close. After turning the valve stem for a long time, the oil seal will leak due to wear and tear. At the same time, because the oil seal is in a deformed state when it is sealed, the oil seal in the current speed control valve is always in a deformed state. Reduced service life of the oil seal

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