A kind of spring piston type pressure reducing valveTechnical field
The utility model relates to pressure reducing valve field, especially a kind of spring piston type pressure reducing valve.
Background technique
Piston reducing valve is that pressure is balanced by piston, flap movement is driven, mainly by adjustment spring, diaphragm, workThe parts such as plug, valve seat, flap composition, is the regeneration product of spring diaphragm reducing valve.Utilize piston direct pick-up downstream pressureFlap is driven, control flap aperture completes pressure-reduced and-regulated function.Although existing piston reducing valve reaches medium in valve bodyDepressurization, but there is also certain defects, such as its stability is low, and sensitivity still has room for promotion.
Summary of the invention
The purpose of this utility model: in order to overcome the drawbacks of the prior art, the utility model provides a kind of stabilityHigh, sensitive spring piston type pressure reducing valve.
The technical solution of the utility model includes: including that there is import, the valve body of outlet and the spool that is located in valve body, the valveIt is also equipped with cap above body, valve rod is also equipped in the valve body, the valve rod is also fixedly connected with spool, in the capEquipped with upper spring, the body base is also equipped with lower cover, and lower spring, institute are arranged with outside the spool to the valve rod between lower coverLower both ends of the spring is stated to be against respectively on spool and lower lid；The inlet and outlet is the form of low in and high out, the valve stem topValve body in be equipped with pistons work chamber, piston, the piston and pistons work chamber are installed on the valve rod of the pistons work chamberInner wall sealing sliding cooperation, the pistons work chamber are communicated with outlet.
By adopting the above technical scheme, medium trend is changed to low in and high out by high in and low out in the prior art, and by upperIt is depressurized under the lower dual spring mode of action, pressure stabilizing essence can be greatly improved by being so changed to downstream pressure by original upstream pressureDegree, sensitivity is effectively promoted, in use, downstream pressure can reach static pressure state.
The further setting of the utility model: being also arranged with locating plate on valve rod, the locating plate and pistons work are intracavitaryWall slip cooperation, the locating plate offer through-hole in the axial direction.
Using above-mentioned further setting, locating plate can position pistons work range, make piston always in pistonAxial stroke side's upward sliding of working chamber.
The further setting of the utility model: on valve rod have step, the step be resisted against on locating plate bottom surface andO-ring is installed between locating plate bottom surface.
Further it is arranged using above-mentioned, O-ring buffers the collision of step and locating plate.
The further setting again of the utility model: the cylinder sleeve with piston cooperation, the valve body and cap are installed on valve bodyCover the cylinder sleeve mounting groove offered respectively for accommodating cylinder sleeve.
Using above-mentioned setting further again, cylinder sleeve is replaceable, saves cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model specific embodiment；
Wherein, valve body 1, spool 2, cap 3, valve rod 4, lower cover 5, import 11, outlet 12, upper spring 61, lower spring 62 are livingFill in working chamber 13, piston 14, locating plate 41, through-hole 411, O-ring 412, cylinder sleeve 15, adjusting bolt 7.
Specific embodiment
A kind of spring piston type pressure reducing valve as shown in Figure 1 including the valve body 1 with import 11, outlet 12 and is located at valveSpool 2 in body 1 is also equipped with cap 3 above the valve body 1, valve rod 4 is also equipped in the valve body 1, the valve rod 4 is alsoIt is fixedly connected with spool 2, is equipped with upper spring 61 in the cap 3,1 bottom of valve body is also equipped with lower cover 5, the spool 2It is arranged with lower spring 62 outside to the valve rod 4 between lower cover 5, lower 62 both ends of spring are against respectively on spool 2 and lower cover 5；InstituteIt states import 11 and outlet 12 is the form of low in and high out, be equipped with pistons work chamber 13 in the valve body 1 at 4 top of valve rod, it is describedPiston 14, the piston 14 and the sealing sliding cooperation of 13 inner wall of pistons work chamber are installed on the valve rod of pistons work chamber 13, it is livingPlug working chamber 13 is communicated with outlet 12.Locating plate 41, wall slip in locating plate 41 and pistons work chamber 13 are also arranged on valve rod 4Cooperation, locating plate 41 offer through-hole 411 in the axial direction.There is step, step is resisted against 41 bottom surface of locating plate on valve rod 4On, and O-ring 412 is installed between 41 bottom surface of step and locating plate.Locating plate 41 can be determined pistons work rangePosition, makes piston 14 always in axial stroke side's upward sliding of pistons work chamber 13.It is equipped on valve body and the cooperation of piston 14The cylinder sleeve mounting groove for accommodating cylinder sleeve is offered on cylinder sleeve 15, valve body 1 and cap 3 respectively.
Utility model works principle is: medium moves towards low in and high out, causes stress loss by throttling and forces inlet-pressurePower reduces a certain desired value in exit and controls outlet pressure base using medium energy itself when flow and pressure changeThis constant purpose.It is that rotation adjusts bolt 7 when adjusting outlet pressure, forces piston 14 to move down, open main valve, changeOrifice size causes stress loss, realizes decompression.Since medium passes through 14 lower section of inlet and outlet inflow piston in valve body after valvePistons work chamber 13, acted on using the elastic force of upper spring 61 and lower spring 62, make to keep balance above piston 14, when pressure andWhen changes in flow rate, main valve orifice size is made to remain corresponding position, the utility model reduces 11 pressure change of import to outThe influence of 12 pressure of mouth, while outlet 12 pressure application surfaces product is increased, it posts and increases sensing element active area, to reduce12 pressure divergence of valve export, substantially increases the precision of voltage regulation.