A kind of novel fluid pressure maintaining valve
Technical field
The present invention relates to a kind of novel fluid pressure maintaining valve.
Background technology
In the prior art, the position that a relief spring carrys out adjusting spool is placed in the cavity of pressure maintaining valve, when pressure maintaining valve
Inlet pressure more than relief spring set pressure when, relief spring be under pressure so that adjusting spool position, go out pressure maintaining valve
Mouth pressure is balanced with spring pressure, reaches voltage stabilizing purpose, but when inlet pressure is less than setting pressure, relief spring also has necessarily
Depressurization, produce certain resistance, make outlet pressure less than inlet pressure, limit some use occasions.
Accordingly, it would be desirable to further improve.
The content of the invention
It is an object of the invention to overcome the shortcomings of that above-mentioned prior art is present, and a kind of novel fluid pressure maintaining valve is provided,
When its outlet pressure is less than or sets pressure, by the regulation of stable-pressure device, keep outlet pressure constant.
The object of the present invention is achieved like this:
A kind of novel fluid pressure maintaining valve, including the valve body of interconnected entrance, outlet and valve body cavity is provided with, it is provided with valve body cavity
Voltage-stabiliser tube, voltage-stabiliser tube head end is provided with the pressure guide hole connected with valve body cavity, tail end and outlet;The valve body is provided with regulation and leads
Press the stable-pressure device of hole aperture.
The stable-pressure device includes pressure stabilizing cavity, valve rod and the valve element of adjustable volume;Valve handle activity is arranged on valve body, its
Head end is stretched into pressure stabilizing cavity, and the position of tail end correspondence voltage-stabiliser tube extends downwardly into valve body cavity, and valve element is arranged on the tail end of valve rod, valve rod
Hollow with valve element and interconnected composition pilot passage, pilot passage is connected with pressure stabilizing cavity, valve body cavity or pressure guide hole respectively, valve
Core opens or closes pressure guide hole with the activity of valve rod;When the outlet pressure is less than setting pressure, pressure stabilizing cavity volume diminishes, valve rod
Moved to the positive direction of pressure guide hole, valve element increases pressure guide hole aperture, until outlet pressure is equal to setting pressure, the outlet pressure
During higher than setting pressure, pressure stabilizing cavity volume becomes big, and valve rod is moved to the opposite direction of pressure guide hole, and valve element reduces pressure guide hole aperture, directly
Setting pressure is equal to outlet pressure.
The stable-pressure device also includes voltage stabilizing elastic valve plate and voltage stabilizing lid, and both mutually cover sealing and constitute pressure stabilizing cavity, valve
The head end of bar is sealedly connected in voltage stabilizing elastic valve plate;Voltage stabilizing elastic valve plate elastic expansion or elastic shrinkage make pressure stabilizing cavity
Volume becomes big or reduces, and drives valve rod to extend downwardly into or shrink upwards, valve element is reduced pressure guide hole aperture or increase pressure guide hole
Aperture.
The valve body is provided with the voltage stabilizing support for installing stable-pressure device, is provided with for accommodating pressure stabilizing cavity in voltage stabilizing support
Counter balance pocket, more than the maximum volume of pressure stabilizing cavity, voltage stabilizing support is provided with that to connect counter balance pocket open to atmosphere for the volume of the counter balance pocket
Through hole.
The valve rod is provided with resetting means, and it is abutted with pressure stabilizing cavity.
The resetting means is back-moving spring.
The voltage-stabiliser tube is located at the inside center of valve body cavity, and pressure guide hole thereon is bellmouth, and valve element is taper valve core.
The voltage stabilizing elastic valve plate is made up of rubber or plastics.
The present invention has the beneficial effect that:
When outlet pressure is higher or lower than setting pressure, stable-pressure device dynamic regulation with the change of outlet pressure makes outlet
Pressure keeps constant, and valve body cavity, when stable-pressure device is adjusted, plays a part of auxiliary adjustment, buffering, further as cushion chamber
Optimizing regulation effect, makes outlet pressure more constant.
Brief description of the drawings
Fig. 1 is the sectional view of one embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
Referring to Fig. 1, this novel fluid pressure maintaining valve, it is characterised in that including being provided with interconnected entrance 11,12 and of outlet
Voltage-stabiliser tube 14 is provided with the valve body 1 of valve body cavity 13, valve body cavity 13, the head end of voltage-stabiliser tube 14 is provided with the pressure guide hole connected with valve body cavity 13
141, tail end is connected with outlet 12;The valve body 1 is provided with the stable-pressure device of the regulation aperture of pressure guide hole 141.Outlet pressure is less than
Or during more than setting pressure, by the regulation of stable-pressure device, still keep outlet pressure constant.
Stable-pressure device includes pressure stabilizing cavity 31, valve rod 51 and the valve element 52 of adjustable volume;Valve rod 51 is movably arranged on valve body 1
On, its head end is stretched into pressure stabilizing cavity 31, and the position of tail end correspondence voltage-stabiliser tube 14 extends downwardly into valve body cavity 13, and valve element 52 is arranged on valve
Hollow and interconnected composition pilot passage 511 in the tail end of bar 51, valve rod 51 and valve element 52, pilot passage 511 respectively with surely
Pressure chamber 31, valve body cavity 13 or pressure guide hole 141 are connected, and valve element 52 opens or closes pressure guide hole 141 with the activity of valve rod 51.
When exporting 12 pressure less than setting pressure, the volume of pressure stabilizing cavity 31 diminishes, and valve rod 51 is moved to the positive direction of pressure guide hole 141
Dynamic, valve element 52 increases the aperture of pressure guide hole 141, so that increase the flow section that fluid passes through voltage-stabiliser tube 14 or pressure guide hole 141, directly
Setting pressure is equal to 12 pressure of outlet(Export 12 pressure constant);Valve body cavity 13 is adjusted as cushion chamber in stable-pressure device
When, playing a part of auxiliary adjustment, buffering, further optimizing regulation effect makes the pressure of outlet 12 more constant.Stable-pressure device with
The change of the pressure of entrance 11 and dynamic regulation, make the pressure of outlet 12 keep constant.
The pressure stabilizing cavity 31 of adjustable volume can be made up of elastomeric material, or be formed by setting elastic device, its bullet
The pressure of elastic recoil is identical with setting pressure.
Stable-pressure device also includes voltage stabilizing elastic valve plate 2 and voltage stabilizing lid 4, and both mutually cover sealing and constitute pressure stabilizing cavity 31.Bullet
Property valve block 2 can be made of with the elastomeric material of larger elastic recoil pressure;Or be made up of Stretch material, then coordinate
Following resetting means with larger elastic recoil pressure, you can meet the use requirement of volume adjusted, those skilled in the art
Member is appreciated that.
The head end of valve rod 51 is sealedly connected in voltage stabilizing elastic valve plate 2;The voltage stabilizing elastic valve plate 2 elastic expansion or elasticity
Contraction makes the volume of pressure stabilizing cavity 31 become big or reduce, and drives valve rod 51 to extend downwardly into or shrink upwards, reduces valve element 52 and leads
The aperture of the pressure aperture of hole 141 or increase pressure guide hole 141, so as to realize the flowing for passing through voltage-stabiliser tube 14 or pressure guide hole 141 to fluid
The regulation of sectional area, makes outlet pressure constant.
Valve body 1 is provided with the voltage stabilizing support 6 for installing stable-pressure device, voltage stabilizing support 6 and is provided with for accommodating pressure stabilizing cavity 31
Counter balance pocket 32, more than the maximum volume of pressure stabilizing cavity 31, voltage stabilizing support 6 is provided with connects counter balance pocket 32 for the volume of counter balance pocket 32
The through hole 41 of air, enable pressure stabilizing cavity 31 freely, unimpededly elastic expansion or elastic shrinkage.
Valve rod 51 is provided with resetting means, and it is abutted with pressure stabilizing cavity 31, and resetting means is back-moving spring 53, can be driven
Pressure stabilizing cavity 31 is set to reset, so as to improve the accommodation accuracy of the pressure of outlet 12 of pressure maintaining valve.
Voltage-stabiliser tube 14 is located at the inside center of valve body cavity 13, and pressure guide hole 141 thereon is bellmouth, and valve element 52 is cone valve
Core, regulating effect is good, can avoid stuck phenomenon, it is ensured that flow of fluid is smooth.
Voltage stabilizing elastic valve plate 2 is made up of rubber or plastics, and resilience effect is good, and its elastic recoil power is easily adjusted, more
It is smaller close to setting pressure, tolerance, further improve regulating effect.
Above-described embodiment is preferred scheme of the invention, and the present invention can also have other embodiments.The technology of this area
Personnel can also make equivalent variations or replacement on the premise of without prejudice to spirit of the invention, and these equivalent modifications or replacement are wrapped
It is contained in the scope set by the application claim.