CN2326796Y - Setting-type torsion control valve - Google Patents

Abstract

The utility model relates to a pressure control valve of a hydraulic system, particularly a stepping setting-type torsion control valve of a pair of hydraulic power tongs used of workover treatment in oil fields. The utility model is a combined valve, which is formed by that a main control valve 1, a safety valve 2, a pilot valve 3 of a gear a, a pilot valve 4 for a gear b, a pilot valve 5 for a gear c, and a manual gear transferring switch 6 are distributed on a valve plate. The utility model has the advantages of small size, more functions, convenient use, the function of a safety valve, three gears, and three reliably set rated working torques desired by the working hydraulic tongs, and therefore, the requirement of workover treatment in oil fields is satisfied.

Description

Setting formula torque control valve

The utility model relates to the branch gear of the hydraulic power plier that the pressure controlled valve of hydraulic system in, particularly oil well repairing operation use and sets the formula torque control valve.

When oil well repairing operation removes oil pipe, twist on the oil pipe with hydraulic power plier, shackle, whole hydraulic system is made up of the oil motor on hydraulic power on the working machine (CB-90 gear pump, relief valve) and the hydraulic tongs.The Operating torque of hydraulic tongs is directly proportional with the pressure that enters oil motor, and a gear pump of the hydraulic power in the real work on the working machine, relief valve damage in a large number, the also normal explosion of the oil hydraulic motor on the hydraulic tongs.Reason is that original hydraulic system has only a pilot operated compound relief valve, set the working pressure of hydraulic system by it, the moving screw thread of the cracking pressure armrest of this pilot operated compound relief valve is adjusted the pretightening force of pilot valve spring a bit a bit, be subjected to system pressure, influences such as flow, the working pressure of adjust system is difficult to exactly, impurity usually causes that also the pilot valve of relief valve blocks in the oil, this moment, main valve can't be opened, and there is not safety valve in the system, cause the unlimited suddenly rising of system pressure like this, thereby cause gear pump, the explosion of oil hydraulic motor damages, and sometimes because of pilot valve is not closed completely, causes the system pressure fluctuation, the strength of hydraulic tongs does not reach the specified tightening torque of oil pipe, thereby cause the spiral shell of oil pipe to spin leakage, pressure testing is defective, causes and does over again.On cannot fasten, can cause also that oil pipe is disconnected takes off, and causes fall well, oil well of oil pipe heavy economic losses such as to scrap.

With the needed tightening torque of the oil pipe of the different size in a bite oil well is different.Because original hydraulic system can not be adjusted working pressure at any time easily, hydraulic tongs also just can not apply different tightening torques to the oil pipe of different size reliably, has so just caused the damage of oil pipe.

The purpose of this utility model is to provide a kind of minute gear to set formula hydraulic tongs torque control valve, and it can regulate last, the shackle of oil pipe effectively, increases the service life.

The purpose of this utility model is to realize like this, the utility model is a combination brake switch and proporting, main control valve (1), safety valve (2), a shelves pilot valve (3), b shelves pilot valve (4), c shelves pilot valve (5) and manual gear throw over switch (6) formation have distributed on a valve plate, be provided with safety valve (2) between the advancing of main control valve (1), back oil road, a shelves pilot valve (3), b shelves pilot valve (4), c shelves pilot valve (5) are connected on respectively on the main control valve (1), and its other end is connected on the manual gear throw over switch (6).

The output torque of hydraulic tongs is directly proportional with the working pressure of hydraulic system.Carry out on two and half oil pipes, during the shackle operation, manual control gear throw over switch forwarded to 1 grade, promptly cracking pressure is the pilot valve connection work of 8Mpa, and other pilot valve is not worked.Like this, after the Operating torque of hydraulic tongs reaches the tightening torque of two and half oil pipes, just no longer increase.In like manner, what be suitable for three cun oil pipes is 2 grades, is 10Mpa.What be suitable for four cun oil pipes, heat insulating tube is 3 grades, is 12Mpa.Each gear switches reliable operation easily by manual control transformation switch.Be provided with safety valve between the advancing of main control valve, back oil road, it fixedly opens pressure is 14Mpa, littler than the rated pressure 16Mpa of gear oil pump.Like this, whole hydraulic system was both safe and reliable, and dual intensity is set different rated torques easily at the oil pipe of different size, has avoided the damage of oil pipe, has also guaranteed the workover eration quality.

The utility model has volume little, the advantage that function is many.Its mounting type is identical with the relief valve of original hydraulic system, former relief valve is laid down, do not increase any component, loading onto the utility model gets final product, so it is very convenient to use, original hydraulic system can not be set the Operating torque of hydraulic tongs reliably, because the utility model can play the effect of safety valve: can divide three gears again, needed three nominal operation moments of torsion when setting out hydraulic tongs work reliably are so satisfied the needs of oil well repairing operation.

Figure is a hydraulic system principle figure of the present utility model.

Further be illustrated below in conjunction with accompanying drawing.

The utility model had both included a safety valve 2, main control valve 1, three fixing 3,4,5 and gear throw over switches 6 that switch the manual control of pilot valve of pilot valve of cracking pressure, this combination brake switch and proporting reaches the binomial technical order: 1, security of system does not have the damage phenomenon of pump, motor and valve.2, can set different tightening torques easily by the oil pipe of different size.Main control valve 1 is the relief valve of a Φ 20mm, and this valve is subjected to three fixedly pilot valve 3,4,5 controls of cracking pressure (8Mpa, 10Mpa, 12Mpa).

The output torque of hydraulic tongs is directly proportional with the working pressure of hydraulic system.Carry out on two and half oil pipes, during the shackle operation, manual control gear throw over switch forwarded to 1 grade, promptly cracking pressure is the pilot valve connection work of 8Mpa, and other pilot valve is not worked.Like this, after the Operating torque of hydraulic tongs reaches the tightening torque of two and half oil pipes, just no longer increase.In like manner, what be suitable for three cun oil pipes is shelves, is 10Mpa.What be suitable for four cun oil pipes, heat insulating tube is shelves, is 12Mpa.Each gear switches reliable operation easily by manual control transformation switch.Be provided with safety valve between the advancing of main control valve, back oil road, it fixedly opens pressure is 14Mpa, littler than the rated pressure 16Mpa of gear oil pump.Like this, whole hydraulic system was both safe and reliable, and dual intensity is set different rated torques easily at the oil pipe of different size, has avoided the damage of oil pipe, has also guaranteed the workover eration quality.

Show among the figure that hydraulic system is in 1 grade of working state, this moment, cracking pressure was the pilot valve 3 connection work of 8Mpa, and other pilot valve is not worked.When the pressure of hydraulic system reached 8Mpa, the spool of pilot valve 3 was opened, and constitute control oil channel, thereby change main control valve 1, the direct oil sump tank of pressure oil, the oil pressure at motor place no longer raises.Like this, after the Operating torque of hydraulic tongs reaches the specified tightening torque of two and half oil pipes, just no longer increase.

When the arrow points on the manual gear throw over switch 6, show that hydraulic system is in a grade working state.This moment, the guide dodged 5 connection work, and pilot valve 3 and 4 has all been shut, and does not work.When the working pressure of hydraulic system surpasses 10Mpa, but when not reaching 12Mpa, can't constitute control oil channel, main control valve is not opened.That is to say: when manual gear throw over switch 6 was set to grade, the working pressure of hydraulic system was exactly again high, and the spool of pilot valve 4 and pilot valve 4 can not opened, can by pilot valve 5 not have constitute control oil channel may.At this moment, tightening in the process of four cun oil pipes, along with the load of hydraulic tongs progressively increases, the working pressure of hydraulic system also progressively increases.When the working pressure of liquid grave system reached 12Mpa, the valve generation of pilot valve 5 was opened, and has constituted control oil channel, thereby opened main control valve 1, and the direct oil sump tank of pressure oil, the oil pressure at motor place no longer raise when guaranteeing that hydraulic tongs reaches the tightening torque of four cun oil pipes.Like this, after the Operating torque of hydraulic tongs reaches the specified tightening torque of four cun oil pipes, just no longer increase.

All do not open or main control valve when malfunctioning at the spool of all pilot valves, safety valve 2 works, and avoids the pressure of hydraulic system infinitely to raise, and prevents the damage of parts such as oil pump, oil motor.

Claims (2)

1, the utility model relates to a kind of pressure controlled valve of hydraulic system, particularly the branch gear of the hydraulic power plier used of oil well repairing operation is set the formula torque control valve, the utility model is a combination brake switch and proporting, main control valve (1) has distributed on a valve plate, safety valve (2), a shelves pilot valve (3), b shelves pilot valve (4), c shelves pilot valve (5) and manual gear throw over switch (6) constitute, it is characterized in that: the advancing of main control valve (1), be provided with safety valve (2) between back oil road, a shelves pilot valve (3), b shelves pilot valve (4), c shelves pilot valve (5) is connected on respectively on the main control valve (1), and its other end is connected on the manual gear throw over switch (6).

2, setting formula torque control valve according to claim 1, it is characterized in that: main control valve (1) is the relief valve of a Φ 20mm, this valve is subjected to three the fixedly pilot valve of cracking pressure 8Mpa, 10Mpa, 12Mpa (3), (4), (5) controls.

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