CN206626033U - A kind of fluid pressure type check valve - Google Patents

Abstract

The utility model discloses a kind of fluid pressure type check valve, including valve string, valve body and unloading cutout valve；Valve string is made up of screw head, interface, piston, big spring, liquid set, big seal, small seal, off-load valve element, core assembly, little spring and guide sleeve excessively, plays a part of controlling liquid；Valve body surface is cast with porous, and its structure is used for standing valve string and unloading cutout valve, and facilitates liquid communication；Unloading cutout valve is made up of housing, valve element, gas plug, fills suitable pressure nitrogen to prevent liquid super-pressure, plays a part of protecting circuit and elements.The utility model sets precision, wide using pressure limit, can bear super-pressure, reasonable in design, energy-conserving and environment-protective are easy to operate.

Description

A kind of fluid pressure type check valve

Technical field

It the utility model is related to technical field of hydraulic pressure, and in particular to a kind of fluid pressure type check valve.

Background technology

Hydraulic system is the key equipment of comprehensive mechanization, and it is related to the security of whole motion process, and in reality Hydraulic system not only security performance is still weak, and the pollution problem of super-pressure draining cannot be solved effectively always,

Therefore, it is necessary to which a kind of new fluid pressure type check valve, to ensure to provide the safety coefficient of normal reliable, and effectively may be used Capable energy-conserving and environment-protective ability.

The content of the invention

The purpose of this utility model is to be directed to existing deficiency, there is provided a kind of fluid pressure type check valve, the check valve work as industrial and mineral Hypertonia, during more than rated pressure, safety valve is depressured automatically, is ensured that liquid backflow re-uses, is played safeguard protection and section The effect of energy environmental protection.

To achieve the above object, the utility model provides following technical scheme：

A kind of fluid pressure type check valve, including valve string, valve body and unloading cutout valve, the valve body are provided with each sky around Chamber, remaining is all fluid path；The fluid path is all connected with left side cavity internal valve string correspondence position；The valve string is installed on In the left cavity of valve body, component include screw head, interface, piston, big spring, cross liquid set, big seal, small seal, off-load valve element, Core assembly, little spring, guide sleeve；The cavity of left and right two is separated by valve body boss；Left side screw head threaded connection interface left end, connects Mouth is threadedly coupled with left side valve body cavity end mouth, insertion piston in inner chamber on the right side of interface, and taper end is inserted in big spring on the right side of piston, crosses liquid Set compression big spring is simultaneously placed on piston taper end, and outside is connected with guide sleeve；The liquid set of crossing is inserted on the inside of guide sleeve, and centre is set Put big seal；Big seal is blocked by small seal in core assembly and unloaded with withstanding core assembly at guide sleeve contact in the lump Lotus valve element, off-load valve element bottom spring and the compression connection of guide sleeve bottom；The interface and guide sleeve are designed with fluid path； The piston termination is relative with off-load valve element termination；Each placement unloading cutout valve in cavity on the right side of the valve body；Unload cutout valve Including：Cylinder body, valve element, gas plug, it is characterised in that：The cylinder interior sets penetrating cavity, and annular through-hole is set in the middle part of cylinder body, left End sets external screw thread；The unloading cutout valve is connected with valve body screw thread；Valve element keeps left side loaded on cylinder interior, and is close to cylinder body card Platform inwall；Sealing ring sealed valve core and cylinder gap；The valve element both ends are designed with cavity, and right side cavity wall is provided with two gas Balance pipe, left side cavity are provided with annular oil leak hole；The gas balance lead to the hole site is relative；The valve element installation end sets chamfering； The gas plug includes plug, hermetic seal, gaseous core, little spring, catch, snap ring；Plug is threadedly coupled with cylinder body right-hand member；It is described stifled Head left side sets cavity, is connected by air admission hole with outer, and sets annular groove in left end inwall；Gaseous core one end is by plug cavity side Air admission hole is inserted, junction sets hermetic seal；Little spring is inserted on gaseous core opposite side stock, little spring withstands catch, and snap ring is tight Patch catch is stuck on the groove of inner chamber；All junctions of the check valve are all sealed by polyformaldehyde back-up ring or rubber or abrasive article.

Compared with prior art, the beneficial effects of the utility model are：

The unloading cutout valve set in check valve, improve the high voltage protective function of check valve, and the pipeline of valve body The secondary recycling of liquid that more can be under general warranty working environment is set, plays a part of energy-conserving and environment-protective.

Brief description of the drawings

Fig. 1 is the utility model structure diagram.

Fig. 2 is utility model works principle sketch.

In figure：1. the big spring 5. of 2. interface of screw head, 3. piston 4., which crosses liquid, covers the 6. big small seals 8. of seal 7. The cylinder body 16. of 14. valve element of off-load valve element 9. core assembly, 10. spring, 11. guide sleeve, 12. valve body, 13. sealing ring 15. is stifled The hermetic seal of 19. little spring of first 17. snap ring, 18. catch, 20. gaseous core 21..

Embodiment：

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and specifically Embodiment, the utility model is further elaborated.

A kind of fluid pressure type check valve, including valve string, valve body and unloading cutout valve, the valve body 12 are provided with each one around Cavity, remaining is all fluid path；The fluid path is all connected with left side cavity internal valve string correspondence position；The valve string installation In in 12 left cavity of valve body, component includes screw head 1, interface 2, piston 3, excessively big spring 4, liquid set 5, big seal 6, small seal 7th, off-load valve element 8, core assembly 9, little spring 10, guide sleeve 11；The cavity of left and right two is separated by valve body boss；Left side screw head 1 The left end of interface 2 is threadedly coupled, interface 2 is threadedly coupled with the cavity port of left side valve body 12, the right side inner chamber of interface 2 insertion piston 3, Taper end is inserted in big spring 4 on the right side of piston, crosses the compression big spring 4 of liquid set 5 and is placed on the taper end of piston 3, outside and the phase of guide sleeve 11 Even；The liquid set 5 of crossing is inserted into the inner side of guide sleeve 11, and centre sets big seal 6；At big seal 6 and the contact of guide sleeve 11 Withstand core assembly 9 in the lump, off-load valve element 8 is blocked by small seal 7 in core assembly 9, the bottom of off-load valve element 8 is with the He of spring 10 The compression connection of the bottom of guide sleeve 11；The interface 2 and guide sleeve 11 are designed with fluid path；The termination of piston 3 and off-load The termination of valve element 8 is relative；Each placement unloading cutout valve in the right side cavity of valve body 12；Unloading cutout valve includes：Cylinder body 15, valve element 14th, gas plug, it is characterised in that：Penetrating cavity is set inside the cylinder body 15, the middle part of cylinder body 15 sets annular through-hole, and left end sets outer Screw thread；The unloading cutout valve is threadedly coupled with valve body 12；Valve element 14 is close to cylinder body 15 and blocked loaded on the side that kept left inside cylinder body 15 Platform inwall；The sealed valve core of sealing ring 13 and cylinder gap；The both ends of valve element 14 are designed with cavity, and right side cavity wall is provided with Two gas balance pipes, left side cavity are provided with annular oil leak hole；The gas balance lead to the hole site is relative；The installation end of valve element 14 is set Put chamfering；The gas plug includes plug 16, hermetic seal 21, gaseous core 20, little spring 19, catch 18, snap ring 17；Plug 16 and cylinder The right-hand member of body 15 is threadedly coupled；The left side of plug 16 sets cavity, is connected by air admission hole with outer, and set and block in left end inwall Annular groove；Air admission hole is inserted in the one end of gaseous core 20 by the cavity side of plug 16, and junction sets hermetic seal 21；The opposite side stock of gaseous core 20 On be inserted in little spring 19, little spring 19 withstands catch 18, and snap ring 17 is close to catch 18 and is stuck on the groove of inner chamber；The institute of the check valve There is junction all to be sealed by polyformaldehyde back-up ring or rubber or abrasive article.

As shown in Fig. 2 utility model works principle sketch：When normal pressure works, highly pressurised liquid passes through main control valve Into after P mouths, open nonreturn valve core and enter A mouths, main control valve stops feed flow, and nonreturn valve core is closed automatically, A intracavity liquid automatic sealing packages Close.When A intracavitary sealing liquids are acted on forming high pressure by external pressure, high pressure automatically opens up A2 mouth valves after increasing to certain pressure Core, liquid return to P mouths, A cavity pressures is declined automatically, and after A cavity pressures decline to a certain extent, valve element is again automatic at A2 mouths Close.When normal pressure works, highly pressurised liquid enters Z mouths by main control valve, promotes piston to open nonreturn valve core at P mouths, The intraoral liquid of A is set to return to P mouths.

Fluid pressure type check valve described in this practical embodiment, simple in construction, reasonable in design, easy to operate, section Can environmental protection, when pressure fluid is too high, during more than rated pressure, off-load valve element movement draining, play safeguard protection effect.

The utility model is illustrated by specific implementation process, without departing from the present invention, may be used also To carry out various conversion and equivalent substitute to patent of the present invention, therefore, the utility model patent is not limited to disclosed specific Implementation process, and the whole embodiments fallen into scope of the patent claims of the present invention should be included.

Claims (2)

1. a kind of fluid pressure type check valve, including valve string, valve body and unloading cutout valve, the valve body (12) are provided with each sky around Chamber, remaining is all fluid path；The fluid path is all connected with left side cavity internal valve string correspondence position；The valve string is installed on In valve body (12) left cavity, component includes screw head (1), interface (2), piston (3), excessively big spring (4), liquid set (5), big seal (6), small seal (7), off-load valve element (8), core assembly (9), little spring (10), guide sleeve (11)；The cavity of left and right two by Valve body boss separates；Left side screw head (1) is threadedly coupled interface (2) left end, interface (2) and left side valve body (12) cavity port threads Connection, interface (2) right side inner chamber insertion piston (3), piston right side taper end are inserted in big spring (4), cross liquid set (5) compression big spring (4) and piston (3) taper end is placed on, outside is connected with guide sleeve (11)；The liquid set (5) of crossing is inserted on the inside of guide sleeve (11), Centre sets big seal (6)；Big seal (6) with withstanding core assembly (9), core assembly in the lump at guide sleeve (11) contact (9) off-load valve element (8) is blocked by small seal (7) in, off-load valve element (8) bottom is pressed with spring (10) and guide sleeve (11) bottom Contracting connection；The interface (2) and guide sleeve (11) are designed with fluid path；Piston (3) termination and off-load valve element (8) termination Relatively；Each placement unloading cutout valve in cavity on the right side of the valve body (12)；Unloading cutout valve includes：Cylinder body (15), valve element (14), Gas plug, it is characterised in that：Penetrating cavity is set inside the cylinder body (15), annular through-hole is set in the middle part of cylinder body (15), left end is set External screw thread；The unloading cutout valve is threadedly coupled with valve body (12)；Valve element (14) is close to loaded on the side that kept left inside cylinder body (15) Cylinder body (15) chuck inwall；Sealing ring (13) sealed valve core and cylinder gap；Valve element (14) both ends are designed with cavity, right side Cavity wall is provided with two gas balance pipes, and left side cavity is provided with annular oil leak hole；The gas balance lead to the hole site is relative；The valve Core (14) installation end sets chamfering；The gas plug includes plug (16), hermetic seal (21), gaseous core (20), little spring (19), gear Piece (18), snap ring (17)；Plug (16) is threadedly coupled with cylinder body (15) right-hand member；Cavity is set on the left of the plug (16), passed through Air admission hole connects with outer, and sets annular groove in left end inwall；Air admission hole is inserted in gaseous core (20) one end by plug (16) cavity side, Junction sets hermetic seal (21)；Little spring (19) is inserted on gaseous core (20) opposite side stock, little spring (19) withstands catch (18), snap ring (17) is close to catch (18) and is stuck on the groove of inner chamber.

2. fluid pressure type check valve according to claim 1, it is characterised in that：All junctions of the check valve are all by gathering Formaldehyde back-up ring or the sealing of rubber or abrasive article.