A plunger throttle valve

Abstract

A plunger-type throttle valve comprises a valve stem, a hard alloy bushing, a valve seat cover, a valve seat spool, a first O-shaped ring, a second O-shaped ring and a valve body. The valve stem and the hard alloy bushing are driven through hand wheels to vertically move in a cavity of the valve seat spool to realize switching and adjusting flow and pressure. Targeted improvement in three directions includes that passageway holes are formed in the valve stem and the hard alloy bushing in a vertically communicated manner, during opening and closing the throttle valve, opening and closing torque is decreased, opening and closing time is shortened, and flow regulating sensitivity is higher; connection of a pin shaft and a pin is added in the valve stem and the hard alloy bushing to strengthen binding force of the valve stem and the hard alloy bushing, endurance of large flow fluid impact is enhanced, the bushing and the valve stem can be prevented from being dropped out, and the hard alloy bushing can be effectively prevented from being broken under tension; a round pin is additionally arranged on a clearance fit place of the valve seat spool and the valve seat cover to prevent the valve seat spool and the valve seat cover from loosening to produce relative motion under high-flow high-pressure fluid impact and lead position deviation of a throttle hole.

Description

technical field [0001] The invention is a plunger type throttle valve used in oil exploitation equipment. Background technique [0002] The plunger throttle valve is installed in the production wing or manifold system of the Christmas tree to control the production flow and pressure of oil and gas wells. See figure 1 , figure 2 The conventional plunger throttle valve shown is provided with a valve stem 1', a carbide bushing 2', a valve seat sleeve 3', a valve seat core 4', an O-ring 5', a retaining ring 6' and a valve body 7' and other components; wherein the valve body 7' is provided with an inlet 30' and an outlet 40', the valve seat sleeve 3' and the valve seat core 4' in the inner cavity of the valve body 7' are connected as a whole by interference fit, and the valve stem 1' and tungsten carbide bushing 2' are connected as a whole by interference fit, O-ring 5' and retaining ring 6' are arranged between seat sleeve 3' and valve body 7'; it is driven by handwheel 20' ...

AI Technical Summary

Problems solved by technology

However, under the working condition of large flow rate (Max.Cv=420), the interior of the valve body will be greatly impacted by high-speed fluid, which will cause problems such as large opening torque of the throttle valve, insensitive flow adjustment, and loud noise.

More importantly, the valve stem 1' and the hard alloy bushing 2' are prone to separation and falling off under the action of high-speed fluid for a long time. In severe cases, the valve stem may even break, puncture the valve seat, and the hard Alloy fragments can also clog and damage downstream equipment

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