CN2136893Y

CN2136893Y - Leading hydraulic control one-way valve

Info

Publication number: CN2136893Y
Application number: CN 92215767
Authority: CN
Inventors: 竺国丰; 夏升
Original assignee: Staff Technical Cooperation Committee Of Yangshupu Water Plant Of Shanghai Water Supply Co
Current assignee: Staff Technical Cooperation Committee Of Yangshupu Water Plant Of Shanghai Water Supply Co
Priority date: 1992-06-26
Filing date: 1992-06-26
Publication date: 1993-06-23
Anticipated expiration: 2002-06-26

Abstract

The utility model relates to a leading hydraulic one-way valve which is formed by that a leading valve and a hydraulic one-way valve are connected detachably to be assembled into a whole, wherein, the leading valve controls that the outlet and the control port of the hydraulic one-way valve are closed or opened, realizing that load pressure is used for pushing the one-way valve off to cause the liquid flow to flow in opposite direction. The valve cores and the valve seats of the leading valve and the hydraulic one-way valve adopt soft and hard structures for improving the sealability and for ensuring favorable service life, and the soft sealing face of the valve core are compressed on the valve seat to be limited. The utility model is particularly suitable for hydraulic systems which need long-term pressure maintaining, and can be used for pneumatic systems with the same effect.

Description

Leading hydraulic control one-way valve

The utility model belongs to a kind of position control valve in the hydraulic transmission technology field.

Known Pilot operated check valve in hydraulic transmission generally comes open check valve without induced pressure, utilize induced pressure, must will lose the very little characteristic of its leakage rate like this at an outlet and a control mouthful selector valve in parallel, does not also adopt this loop in the practicality; Pilot operated check valve is to utilize mitre velve to seal in addition, and along with the pollution of cone valve wearing and tearing or oil, sealability will reduce.

The purpose of this utility model is that design is a kind ofly started to control making usefulness by pilot valve, utilizes induced pressure to make the one-way valve of liquid stream reverse flow, and its spool valve seat is not easy to wear, is subjected to the pollution effect of oil little, and long-term maintenance is not leaked.

For achieving the above object, the utility model proposes a kind of leading type Pilot operated check valve, it is combined integrated with releasable connection by two-position three way pilot valve and Pilot operated check valve two-part.By the commutation effect of pilot valve, make outlet, control mouthful disconnection or the connection of Pilot operated check valve, realize utilizing induced pressure to push one-way valve open, make liquid stream reverse flow.The spool valve seat of pilot valve and Pilot operated check valve adopts the soft or hard structure, and the decrement of spool is restricted on valve seat, and this structure can improve sealing, and is not easy to wear little with the pollution effect that is subjected to oil, under high pressure also can keep good working life.

Below in conjunction with accompanying drawing the utility model embodiment is described in further detail.

Fig. 1 is the sectional drawing of present embodiment electromagnetic pilot Pilot operated check valve.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Fig. 3 is another enlarged view of Fig. 1.

Fig. 4 is the fundamental circuit of known hydraulic lift.

Fig. 5 is after adopting the electromagnetic pilot Pilot operated check valve, the fundamental circuit of hydraulic lift.

Fig. 6 is the fundamental circuit of known accumulator instant operation.

Fig. 7 is after adopting manual guide's Pilot operated check valve, the fundamental circuit of accumulator instant operation.

Electromagnetic pilot Pilot operated check valve such as Fig. 1, Fig. 2, shown in Figure 3, this valve is combined integrated with nut 6 by two-position three way normal open type electromagnetic priority valve and Pilot operated check valve two-part.Pilot valve is an off-position among the figure, and guide's spool 7 is borrowed spring 8 and induced pressure will move iron core 2 through push rod 5 to separate oil inlet P with fixed core 3 ₁, oil outlet A ₁Communicate drain tap L sealing.Screw 1 is in order to regulate moving iron core 2 adhesive distances, and the opening amount of guide's spool 7 can select the thickness of spacer sheet 9 to guarantee.Pilot operated check valve oil outlet A, control chamber K on valve body 10 path respectively with the oil inlet P of pilot valve ₁With oil outlet A ₁Communicate.Guide's spool 7 upper-lower seal faces and nonreturn valve core 12 sealing surfaces polyamine fat rubber curing forming, rubber hardness is HS75 ± 5, and the plane sealing seat highly is 0.5 ± 0.1MM, and the rubber decrement is restricted on E, F, G face.

When 4 energisings of electromagnetic pilot valve coil, guide's spool 7 moves down, P ₁Be closed, the K chamber is through A ₁Communicate with the L mouth, this moment, Pilot operated check valve played the one-way valve effect, and nonreturn valve core 12 overcomes spring 11 power and moves to left under the effect of P mouth oil pressure, and the oil-feed of A mouth oppositely ends.When coil 4 outages, move on guide's spool 7, the L mouth ends, and A mouth oil pressure is through P ₁Mouth, A ₁Mouth communicates with piston mandril 13 right-hand member K chambeies, and piston mandril 13 is pushed nonreturn valve core 12 open, and A mouth, P mouth communicate, liquid stream reverse flow.

Present embodiment our experiments show that, range of working pressure 0.4-18MPa, and leakage rate zero, working life is greater than 5000 hours (also in experiment).

Pilot valve in the present embodiment adopts Electromagnetic Control, for other control mode, for example: manually, surge, motor-drivenly be suitable for too.The utility model leading type Pilot operated check valve is mainly used in hydraulic transmission, is used for Pneumatic Transmission, and effect is identical, and different is will install Sealing additional at ram piston 12 places.

The utility model advantage is: 1, sealing is reliable, can keep for a long time not leaking; 2, can utilize induced pressure to push one-way valve open; 3, be used for some hydraulic system and can simplify the loop.

In order further to state above-mentioned some advantage clearly, be exemplified below:

Example 1, Fig. 4 is the fundamental circuit of known hydraulic lift, the piston elevate a turnable ladder quits work to needs height oil pump.Realize pressurize with one-way valve and sutaining valve, 4 hours pistons descend and are not more than 10MM, and along with the pollution of sealing surface wear and oil, pressure maintaining performance will descend.Fig. 5 adopts the electromagnetic pilot Pilot operated check valve to carry out pressurize, and the dwell time is long especially, in general, only is subjected to the influence of oil cylinder internal leakage.

Example 2, Fig. 6 is the fundamental circuit of known accumulator instant operation, when oil gear breaks down and have a power failure, as emergent power source.Fig. 7 adopts manual guide's Pilot operated check valve to replace one-way valve and hydraulic control Twoway valves, even pump shuts down for a long time, also can provide emergent power source at any time.

Claims

1, a kind of leading type Pilot operated check valve, it comprises: a two-position three way pilot valve, this valve has oil inlet P ₁, oil outlet A ₁, drain tap L, utilize steering force and spring, make 7 reciprocating actions of guide's spool, realize the commutation effect on liquid road, a Pilot operated check valve, this valve have filler opening f, oil outlet A, control chamber K, utilize induced pressure to feed the K chamber, push nonreturn valve core 12 open, it is characterized in that: P through piston mandril 13 ₁Mouth, A ₁Mouthful be arranged on the valve body 10, and respectively on valve body the A mouth of path and Pilot operated check valve, K chamber communicate, two valves are combined integrated with releasable connection.

2, according to right 1 described leading type Pilot operated check valve, it is characterized in that: during one-way flow, P ₁The mouth sealing, A ₁Mouth, L mouth communicate with the K chamber; Reverse flow, the sealing of L mouth, P mouth, P ₁Mouth, A ₁Mouth communicates with the K chamber.

3, according to right 1 described leading type Pilot operated check valve, it is characterized in that: the spool valve seat of pilot valve and Pilot operated check valve adopts the soft or hard structure, and the soft sealing face of guide's spool 7 and nonreturn valve core 12 is restricted on valve seat.