CN213017941U

CN213017941U - Pressure reducing valve

Info

Publication number: CN213017941U
Application number: CN202021627983.9U
Authority: CN
Inventors: 高广宇; 唐兴成; 李来彬; 高贵松
Original assignee: Idc Plumbing & Heating Technology Beijing Co ltd
Current assignee: Idc Plumbing & Heating Technology Beijing Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-04-20
Anticipated expiration: 2030-08-07

Abstract

The utility model relates to a pressure reducing valve is equipped with cage form case in the valve pocket, and the valve pocket is direct with the import, and with export through locating the first medium passageway intercommunication on the valve body diapire, the roof and the valve rod sliding seal cooperation of case, diapire and valve rod leave the interval, the bottom of valve rod is connected with the bolt, the head end of bolt is downward and is located the below of first medium passageway, the fixed cover in valve rod top is equipped with the diaphragm, leaves the clearance between diaphragm and the case, and the clearance passes through the export of second medium passageway intercommunication, the outer fringe of diaphragm with the inner wall of the top port of valve body is sealed, is equipped with the spring that the top pushed away the diaphragm downwards in the. The utility model discloses an adjusting first media passageway's area of overflowing and adjusting medium pressure, comparing and adjusting medium pressure through the area of overflowing of adjusting the export in traditional relief pressure valve, because first media passageway's area of overflowing is less than the area of overflowing of export, under the same action range of throttle part and pressure regulating part, the range of regulation of area of overflowing is little, and medium pressure's regulation precision is high.

Description

Pressure reducing valve

Technical Field

The utility model relates to a valve especially relates to a relief pressure valve.

Background

The pressure reducing valve is a valve which reduces the medium pressure at an inlet to a certain required medium pressure at an outlet through regulation and automatically keeps the medium pressure at the outlet stable by means of the energy of the medium. The traditional pressure reducing valve is generally divided into a diaphragm type and a piston type according to structural forms, medium pressure is generally adjusted by changing the flow area of a valve outlet, and because the caliber of the valve outlet is generally large, when the flow area of the valve outlet is changed through a throttling component, any one small action can cause large change of medium flow, so that the medium pressure has large change, and the adjustment precision of the valve on the medium pressure is low. In addition, conventional pressure reducing valves generally do not have a back-flow preventing and self-protecting function, and when the pressure of the medium at the outlet suddenly rises due to an accident, a medium reverse flow is easily formed.

SUMMERY OF THE UTILITY MODEL

For overcoming the above-mentioned defect of prior art, the utility model provides a relief pressure valve, simple structure, medium pressure adjusts the precision height.

The utility model discloses realize above-mentioned purpose's technical scheme is: a pressure reducing valve comprises a valve body, wherein a medium inlet and a medium outlet are arranged on the valve body, a valve cavity is arranged in the valve body, a valve seat is arranged in the valve cavity, a vertical cage-shaped valve core is fixedly arranged on the valve seat, the valve cavity is directly communicated with the medium inlet, the valve cavity is communicated with the medium outlet through a first medium channel, the first medium channel is arranged on the bottom wall of the valve body, a communication port of the first medium channel and the valve cavity is positioned below the valve seat, a valve rod is coaxially inserted in the valve core, the top wall of the valve core is in sliding sealing fit with the outer wall of the valve rod, a space is reserved between the bottom wall of the valve core and the outer wall of the valve rod, a bolt is coaxially connected with the bottom end of the valve rod, the head end of the bolt faces downwards and is positioned below the communication port of the first medium channel and the valve cavity, the diaphragm is positioned above the valve core, an annular gap is reserved between the diaphragm and the top wall of the valve core, the outer edge of the diaphragm is sealed with the inner wall of the top end port of the valve body, a second medium channel which is communicated with the annular gap and the medium outlet is arranged on the valve body, the top end of the valve body is connected with a valve cover, and a vertical cylindrical spring which is used for pushing the diaphragm downwards is arranged in the valve cover.

Preferably, the bottom end of the valve body is provided with a vertical opening communicated with the valve cavity, the inner diameter of the vertical opening is the same as that of the valve seat, and the vertical opening is connected with a valve cap.

Preferably, the valve cap includes head and hollow neck, and its neck upwards stretches into in the valve chamber, be equipped with on the lateral wall of neck and be used for the intercommunication first medium passageway with the through hole of valve chamber, the external diameter of the head end of bolt is less than the internal diameter of the neck of valve cap, the head end of bolt is located in the neck of valve cap and be located the below of through hole.

Preferably, a screw rod is coaxially and threadedly connected to the top wall of the valve cover, the bottom end of the screw rod is located in the valve cover, the top end of the cylindrical spring abuts against the bottom end of the screw rod through a spring pressing sheet, the valve rod extends upwards out of the diaphragm, and the bottom end of the cylindrical spring is sleeved on the valve rod and abuts against the top surface of the diaphragm.

Preferably, the outer wall of the valve core is sleeved with a cylindrical filter screen.

Preferably, a through hole communicated with the medium outlet is formed in the side wall of the valve body, and a plug is connected to the through hole.

Preferably, the valve rod is provided with a shaft hole along the axis, the top end of the shaft hole is closed, the bolt is connected to the bottom end of the shaft hole, the shaft hole comprises a narrow-diameter shaft hole positioned at the upper part and a wide-diameter shaft hole positioned at the lower part, a first horizontal hole penetrating through a hole wall is arranged on the hole wall of the wide-diameter shaft hole, a second horizontal hole penetrating through the hole wall is arranged on the hole wall of the narrow-diameter shaft hole, the inner edge of the top wall of the valve core blocks the second horizontal hole, a rubber ball is arranged in the wide-diameter shaft hole, the diameter of the rubber ball is smaller than the diameter of the wide-diameter shaft hole and larger than the diameter of the narrow-diameter shaft hole, a screw is screwed on the hole wall of the wide-diameter shaft hole, the tail end of the screw extends into the wide-diameter shaft hole and leaves a space with the hole wall, the space is, the rubber ball is positioned above the screw.

Preferably, the first horizontal hole is located on a side of the valve rod facing the medium inlet direction, the second horizontal hole is located on a side of the valve rod facing the medium outlet direction, an axis of the first horizontal hole is parallel to an axis of the medium inlet, and an axis of the second horizontal hole is parallel to an axis of the medium outlet.

Preferably, the axis of the screw is the same height as the axis of the first horizontal hole and is located on the same straight line.

Preferably, the wide-diameter shaft hole and the narrow-diameter shaft hole are transited through a conical surface, and the conical surface forms a ball seat of the rubber ball.

The utility model has the advantages that:

1. the utility model discloses during the regulation medium pressure, the cage form case in the valve chamber is flowed through to the high pressure medium that comes from the medium import, flow in first medium passageway from the interval between case bottom wall and the valve rod, reentrant medium export, then flow in the annular gap between diaphragm and the case from second medium passageway, upwards promote the diaphragm, make the diaphragm overcome cylindrical spring's thrust downwards, drive the valve rod upward movement, the head end through the bolt blocks or the intercommunication mouth of the first medium passageway of shutoff part and valve chamber, adjust the area of overflowing of first medium passageway, it is balanced to the thrust downwards of diaphragm with cylindrical spring to the thrust upwards of diaphragm until the medium, realize the regulation to medium pressure. When high-pressure medium flows through the space between the cage-shaped valve core and the bottom wall of the valve core and the valve rod, medium pressure can be reduced in a small range due to the fact that the flow area is smaller than the flow area of the medium inlet and the effect of the filter screen, the flow area adjusted by the head end of the bolt is actually the flow area of the through hole in the valve cap, and the flow area of the through hole is far smaller than the flow area of the medium outlet.

2. The utility model discloses a setting of shaft hole and rubber ball in the valve rod, when the medium pressure of medium entrance point is greater than the medium pressure of medium exit end, the high-pressure medium that comes from the medium import gets into the wide footpath shaft hole from first horizontal hole, upwards promote the narrow footpath shaft hole of rubber ball shutoff, when the medium pressure of medium exit end risees suddenly and is greater than the medium pressure in the valve chamber because unexpected condition, in the ascending in-process of diaphragm drive valve rod, annular gap between second horizontal hole intercommunication diaphragm and the case, the high-pressure medium that comes from the medium export gets into the narrow footpath shaft hole from second horizontal hole through annular gap, promote the rubber ball downwards, the high-pressure medium gets into the valve pocket through wide footpath shaft hole and first horizontal hole, the medium pressure in balanced valve pocket and the medium export rapidly, can effectively avoid the medium countercurrent.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a perspective view of the valve cartridge of the present invention;

FIG. 3 is a perspective view of the bonnet of the present invention;

fig. 4 is a schematic sectional structural view of the valve stem of the present invention.

Detailed Description

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses a pressure reducing valve, including valve body 1, be equipped with medium import 2 and medium export 3 on the valve body, be equipped with the valve pocket in the valve body, be equipped with disk seat 4 in the valve pocket, fixed vertical case 5 that is equipped with on the disk seat, the case with the sealed cooperation of disk seat can be equipped with the sealing washer of suitable shape and quantity between the two, the case is the cage form, and its main part comprises a plurality of vertical cage strips 51 along circumference equidistant range, comes from the medium warp of medium import the interval between the cage strips flows in the inner space of case. The valve cavity is communicated with the medium inlet, the valve seat seals a through space between the valve cavity and the medium outlet, the valve cavity is communicated with the medium outlet through a first medium passage 6, the first medium passage is arranged on the bottom wall of the valve body, the first medium passage is preferably arranged in a manner that the valve cavity is inclined upwards towards the direction of the medium outlet, a communication port between the first medium passage and the valve cavity is positioned below the valve seat, and the flow area of the first medium passage is smaller than that of the medium outlet. The valve core is internally coaxially inserted with a valve rod 7, the top wall of the valve core is in sliding seal fit with the outer wall of the valve rod, seal rings with proper shapes and quantity can be arranged between the top wall of the valve core and the outer wall of the valve rod, a space is reserved between the bottom wall of the valve core and the outer wall of the valve rod for a medium to flow through, the bottom end of the valve rod is coaxially connected with a bolt 8 (usually in threaded connection), the head end of the bolt is downward and is positioned below a communication port between the first medium channel and the valve cavity, and the bolt is used for adjusting the flow area of the first medium channel when the valve rod drives the valve rod to move upwards so as to adjust the medium. The valve comprises a valve rod, a diaphragm 9 is coaxially fixed and sleeved on the valve rod in an annular shape, a middle hole for penetrating the valve rod is formed in the diaphragm, the diaphragm is usually made of rubber nylon, an annular gap 10 is reserved between the diaphragm and the top wall of the valve core and positioned above the valve core, the diaphragm can be tightly pressed on an annular boss (diaphragm mounting table) protruding outwards in the radial direction on the valve rod through a nut screwed on the top of the valve rod, a second medium channel 11 for communicating the annular gap with a medium outlet is arranged on the valve body, the second medium channel is preferably arranged in an inclined and upward manner from the medium outlet to the annular gap direction, a valve cover 12 is connected (in a threaded manner) at the top end of the valve body, the valve cover is usually in a cylindrical shape or a truncated cone shape, the diaphragm is positioned at the top end port of the valve body and is clamped and fixed through a tongue-and groove (annular step) shaped matching structure on the, therefore, the outer edge of the diaphragm is sealed with the valve body and fixed on the valve body, the lower end of the valve cover rotates on the top end port of the valve body, and a vertical cylindrical spring 13 used for pushing the diaphragm downwards is arranged in the valve cover.

When the pressure reducing valve is applied, the pressure reducing valve is installed on a medium pipeline through the medium inlet and the medium outlet, a high-pressure medium from the medium inlet flows through the valve core in the valve cavity, flows into the first medium channel from the distance between the bottom wall of the valve core and the valve rod, then enters the medium outlet, and then flows into the annular gap from the second medium channel to push the diaphragm upwards, so that the diaphragm overcomes the downward thrust of the cylindrical spring to drive the valve rod to move upwards, and the communication port of part of the first medium channel and the valve cavity is blocked or plugged through the head end of the bolt to adjust the flow area of the first medium channel until the upward thrust of the medium to the diaphragm is balanced with the downward thrust of the cylindrical spring to the diaphragm, so that the adjustment of medium pressure is realized.

The bottom end of the valve body is preferably provided with a vertical opening communicated with the valve cavity, the inner diameter of the vertical opening is the same as that of the valve seat, and the vertical opening is connected with a valve cap 14. The bonnet preferably includes a head 141 and a hollow neck 142, which may be externally threaded, the vertical opening can be internally provided with an internal thread matched with the external thread, the bonnet is in threaded connection with the vertical opening, the neck of the bonnet is screwed upwards into the valve cavity, the head part of the valve body is abutted against the bottom wall of the vertical opening, the side wall of the neck part is provided with a through hole 143 for communicating the first medium channel and the valve cavity, the flow area of the through hole is preferably smaller than that of the first medium channel, a radial outward annular groove 15 is arranged on the side wall of the valve cavity at the communicating port of the first medium channel and the valve cavity to form a communicating channel of the through hole and the first medium channel, the number of the through holes can be multiple, and 4, a plurality of through holes are uniformly distributed on the neck of the valve cap along the circumferential direction at equal intervals. The diapire of case with leave the interval usually between the disk seat, the neck upper end screw in of valve cap the diapire of case with between the disk seat and with the two sealed cooperation, the neck of valve cap the diapire of case with the disk seat can be equipped with the sealing washer of suitable shape and quantity between two liang, the external diameter of the head end of bolt is less than the internal diameter of the neck of valve cap, the head end of bolt is located in the neck of valve cap and be located the below of through hole, work as the valve rod drives when the bolt rebound, through the head end of bolt is adjusted the flow area of through hole adjusts medium pressure. The outer diameter of the head end of the bolt is preferably slightly smaller than the inner diameter of the neck of the bonnet (e.g., the distance between the head end and the neck is 1-5 mm), and the height of the head end of the bolt is preferably the same as the vertical bore diameter of the through hole, so as to achieve a better throttling effect. The outer diameter of the head end of the bolt is preferably larger than the inner diameter of the bottom wall of the valve core, so that the valve core can limit the upward movement of the head end of the bolt.

The top wall of the valve cover is preferably coaxially and threadedly connected with a screw rod 16, the bottom end of the screw rod is located in the valve cover, the top end of the cylindrical spring abuts against the bottom end of the screw rod through a disc-shaped spring pressing sheet, the top end of the cylindrical spring can be sleeved on a lower convex part of the spring pressing sheet, the valve rod extends upwards out of the diaphragm, the bottom end of the cylindrical spring is sleeved on the valve rod to facilitate axial positioning, and the bottom end of the cylindrical spring abuts against the top surface of the diaphragm through a gasket sleeved on the valve rod. By rotating the screw, the downward thrust of the cylindrical spring against the diaphragm can be adjusted, thereby setting and adjusting the regulation pressure of the pressure reducing valve.

The outer wall of the valve core is preferably sleeved with a cylindrical filter screen 17 for filtering impurities in the medium from the medium inlet, and the filter screen is preferably a stainless steel filter screen.

The side wall of the valve body is preferably provided with a through hole communicated with the medium outlet and used for being connected with a pressure gauge, the through hole is connected with a plug, and the plug is preferably in threaded connection with the through hole.

The valve rod is preferably provided with a shaft hole along the axis from bottom to top, the top end of the shaft hole is closed (namely, the upper end of the shaft hole does not penetrate through the valve rod), the bottom hole wall of the shaft hole can be provided with an internal thread matched with the external thread of the bolt, and the bolt is in threaded connection with the bottom end of the shaft hole. The shaft hole preferably comprises a narrow-diameter shaft hole 71 positioned at the upper part and a wide-diameter shaft hole 72 positioned at the lower part, the narrow-diameter shaft hole is communicated with the wide-diameter shaft hole, a first horizontal hole 73 penetrating through a hole wall is arranged on the hole wall of the wide-diameter shaft hole, the first horizontal hole is communicated with the wide-diameter shaft hole and the inner space of the valve core, a second horizontal hole 74 penetrating through the hole wall is arranged on the hole wall of the narrow-diameter shaft hole, the inner edge of the top wall of the valve core blocks the second horizontal hole, a rubber ball 75 is arranged in the wide-diameter shaft hole, the diameter of the rubber ball is smaller than that of the wide-diameter shaft hole and larger than that of the narrow-diameter shaft hole, so that the rubber ball can freely move up and down in the wide-diameter shaft hole without entering the narrow-diameter shaft hole, the rubber ball can block the bottom hole opening of the narrow-diameter shaft hole when moving up to the bottom end of the narrow-diameter shaft, the tail end of the screw extends into the wide-diameter shaft hole, a space is reserved between the tail end of the screw and the opposite hole wall, the space is smaller than the diameter of the rubber ball, preferably smaller than the radius of the rubber ball, the axial height of the screw is not lower than that of the first horizontal hole, and the rubber ball is located above the screw. With such arrangement, when the medium pressure at the medium inlet end is greater than the medium pressure at the medium outlet end, after a high-pressure medium from the medium inlet flows into the internal space of the valve core, the medium enters the wide-diameter shaft hole from the first horizontal hole, the rubber ball is pushed upwards to block the narrow-diameter shaft hole, when the medium pressure at the medium outlet end suddenly rises due to an unexpected situation and is greater than the medium pressure in the valve cavity (i.e. the internal space of the valve core, the same applies below), the second horizontal hole is communicated with the annular gap between the diaphragm and the valve core in the rising process of the valve rod driven by the diaphragm, the high-pressure medium from the medium outlet enters the narrow-diameter shaft hole from the second horizontal hole through the annular gap, and at this time, the medium pressure in the narrow-diameter shaft hole is higher than the medium pressure in the wide-diameter shaft hole, the medium pushes the rubber ball downwards, and high-pressure medium enters the valve cavity through the wide-diameter shaft hole and the first horizontal hole, so that the medium pressure in the valve cavity and the medium outlet is rapidly balanced, and the medium backflow can be effectively avoided.

The first horizontal hole is preferably located on one side of the valve rod facing the medium inlet direction, the second horizontal hole is preferably located on one side of the valve rod facing the medium outlet direction, an axis of the first horizontal hole is parallel to an axis of the medium inlet and located in the same vertical plane, so that a medium entering the valve cavity can enter the wide-diameter shaft hole through the first horizontal hole under the condition that pressure is not lost (or loss is small), an axis of the second horizontal hole is parallel to an axis of the medium outlet and located in the same vertical plane, and an axis of the second medium channel is preferably located in the same vertical plane as an axis of the medium outlet.

The axis of the screw and the axis of the first horizontal hole are preferably the same in height and are located on the same straight line.

The wide-diameter shaft hole and the narrow-diameter shaft hole are preferably in transition through conical surfaces, and the conical surfaces form a ball seat 77 of the rubber ball, so that when the rubber ball is pushed upwards by a medium from the valve cavity to block the narrow-diameter shaft hole, the sealing effect is ensured.

Claims

1. A pressure reducing valve comprises a valve body, wherein a medium inlet and a medium outlet are arranged on the valve body, a valve cavity is arranged in the valve body, and the pressure reducing valve is characterized in that a valve seat is arranged in the valve cavity, a vertical cage-shaped valve core is fixedly arranged on the valve seat, the valve cavity is directly communicated with the medium inlet, the valve cavity is communicated with the medium outlet through a first medium channel, the first medium channel is arranged on the bottom wall of the valve body, a communication port of the first medium channel and the valve cavity is positioned below the valve seat, a valve rod is coaxially inserted in the valve core, the top wall of the valve core is in sliding sealing fit with the outer wall of the valve rod, a space is reserved between the bottom wall of the valve core and the outer wall of the valve rod, a bolt is coaxially connected with the bottom end of the valve rod, the head end of the bolt faces downwards and is positioned below the communication port of the first, the diaphragm is positioned above the valve core, an annular gap is reserved between the diaphragm and the top wall of the valve core, the outer edge of the diaphragm is sealed with the inner wall of the top end port of the valve body, a second medium channel which is communicated with the annular gap and the medium outlet is arranged on the valve body, the top end of the valve body is connected with a valve cover, and a vertical cylindrical spring which is used for pushing the diaphragm downwards is arranged in the valve cover.

2. The pressure reducing valve according to claim 1, wherein a vertical opening communicated with the valve cavity is formed at the bottom end of the valve body, the inner diameter of the vertical opening is the same as that of the valve seat, and a valve cap is connected to the vertical opening.

3. The pressure reducing valve according to claim 2, wherein the valve cap includes a head portion and a hollow neck portion, the neck portion of the valve cap extends upward into the valve chamber, a through hole is formed in a sidewall of the neck portion for communicating the first medium passage with the valve chamber, an outer diameter of a head end of the bolt is smaller than an inner diameter of the neck portion of the valve cap, and the head end of the bolt is located in the neck portion of the valve cap and below the through hole.

4. The pressure reducing valve according to claim 3, wherein a screw is coaxially screw-coupled to a top wall of the bonnet, a bottom end of the screw is located within the bonnet, a top end of the cylinder spring abuts against a bottom end of the screw through a spring pressing plate, the valve stem extends upward from the diaphragm, and a bottom end of the cylinder spring is fitted over the valve stem and abuts against a top surface of the diaphragm.

5. The pressure reducing valve according to claim 4, wherein a cylindrical filter screen is sleeved on the outer wall of the valve core.

6. The pressure reducing valve according to claim 5, wherein a through hole communicating with the medium outlet is provided on a side wall of the valve body, and a plug is connected to the through hole.

7. The pressure reducing valve according to claim 1, 2, 3, 4, 5 or 6, wherein the valve rod is provided with a shaft hole along an axis, the top end of the shaft hole is closed, the bolt is connected to the bottom end of the shaft hole, the shaft hole comprises a narrow-diameter shaft hole at the upper part and a wide-diameter shaft hole at the lower part, a first horizontal hole penetrating through a hole wall is arranged on the hole wall of the wide-diameter shaft hole, a second horizontal hole penetrating through the hole wall is arranged on the hole wall of the narrow-diameter shaft hole, the inner edge of the top wall of the valve core blocks the second horizontal hole, a rubber ball is arranged in the wide-diameter shaft hole, the diameter of the rubber ball is smaller than the diameter of the wide-diameter shaft hole and larger than that of the narrow-diameter shaft hole, a screw is screwed on the hole wall of the wide-diameter shaft hole, the tail end of the screw extends into the wide-diameter shaft hole, the height of the axis of the screw is not lower than that of the axis of the first horizontal hole, and the rubber ball is located above the screw.

8. The pressure reducing valve according to claim 7, wherein the first horizontal hole is located on a side of the valve stem facing the medium inlet direction, the second horizontal hole is located on a side of the valve stem facing the medium outlet direction, an axis of the first horizontal hole is parallel to an axis of the medium inlet, and an axis of the second horizontal hole is parallel to an axis of the medium outlet.

9. The pressure reducing valve according to claim 8, wherein the axis of the screw is at the same height as the axis of the first horizontal hole and is located on the same straight line.

10. The pressure relief valve of claim 9, wherein said wide bore and said narrow bore transition through a tapered surface, said tapered surface forming a ball seat for said rubber ball.