CN105065682A - Cage sleeve type throttle valve - Google Patents

Abstract

The invention discloses a cage sleeve type throttle valve which comprises a valve body (14), a valve seat (15) installed in the valve body (14) and a spring (13) installed in a hole of the valve seat (15). A pressing ring (11) is pressed on the valve seat (15) after being connected with the valve body (14), the outer circle of the valve seat (15) is sleeved with a lower inner hole of a cage sleeve (7), and the outer circle of a valve rod (5) is sleeved with an upper inner hole of the cage sleeve (7). A valve deck (6) is installed on the valve body (14) and connected with the valve rod (5) through threads. A cylindrical filtering support (17) is connected with the lower end of the valve deck (6), the upper end of the valve rod (5) is connected with a hand wheel (1), the lower end of the valve rod (5) is connected with the cage sleeve (7), and a cage sleeve balance hole (71) in the cage sleeve (7) is communicated with a valve rod balance hole (51) in the valve rod (5). The cage sleeve type throttle valve is reasonable in structural design, low in noise, resistant to erosion and abrasion and long in service life, and flow can be precisely controlled.

Description

A cage type throttle valve

technical field

The invention designs a throttling valve, specifically a cage-type throttling valve with stable performance, low noise, precise flow control, erosion resistance, wear resistance and long service life.

Background technique

The currently used throttle valves mainly include needle valve type throttle valve, disc type throttle valve, and cage type throttle valve, and the cage type throttle valve has a better throttling effect, but the cage type throttle valve There are the following disadvantages: (1) solid particles such as sand grains are accompanied in the fluid, and the mixed fluid directly scours the cage hole and valve seat at high speed, which will cause rapid wear and tear of the cage hole and valve seat, fast wear and short life. (2) The cage and the valve stem are in a gap connection or the cage and the valve stem are integrated, resulting in inaccurate flow control, unstable throttling and high noise. (3) When the valve is closed, the cage and the valve core are in direct contact, resulting in a violent impact and damage to the cage. Therefore, enhancing the wear resistance and erosion resistance of the cage-type throttle valve seat and the cage is the only way to improve the service life of the cage-type throttle valve.

Therefore, it is necessary to design and develop a cage with reasonable structure design, stable operation, low noise, precise flow control, good sealing performance, erosion resistance, wear resistance and long service life based on the existing technology. Throttle valve.

Contents of the invention

Purpose of the invention: The purpose of the invention is to provide a cage-type throttle valve with reasonable structure design, stable operation, low noise, precise flow control, good sealing performance, erosion resistance, wear resistance and long service life.

Technical scheme: in order to realize the purpose of the present invention, the technical scheme adopted in the present invention is:

A cage-type throttle valve, which includes a valve body, a valve seat installed in the valve body, a spring installed in the hole of the valve seat, a compression circle and the valve body are connected by threads and then pressed on the valve seat, and the cage The lower inner hole of the cage is set on the outer circle of the valve seat, and the upper inner hole of the cage is set on the outer circle of the valve stem; the valve cover is installed on the valve body through bolts, and the valve cover is threadedly connected with the valve stem; The shape filter bracket is fixedly connected with the lower end of the valve cover, the transparent cover is connected with the upper end of the valve cover, the upper end of the valve stem is connected with the hand wheel, the lower end of the valve stem is connected with the cage, and the cage balance hole on the cage is balanced with the valve stem on the valve stem. The holes are connected, and a hard alloy bushing is installed in the cage hole;

The cylindrical filter bracket includes a cylindrical frame, an upper retaining ring, a lower retaining ring and copper wires, the upper retaining ring and the lower retaining ring are respectively installed on the cylindrical frame, and the copper wires are arranged and wound around the cylindrical frame The outer circle of the cylindrical frame is provided with a radial hole of the cylindrical frame and a longitudinal groove of the cylindrical frame;

Three rows of orifices are opened on the outer circle of the valve seat near the axial center line.

As a preferred solution, in the above-mentioned cage-type throttle valve, the connection between the lower end of the bonnet and the valve stem is provided with a gasket, a metal sealing ring and a back-up ring sequentially from top to bottom.

As a preferred solution, in the above-mentioned cage-type throttle valve, an indicator nut is installed on the upper part of the valve stem, which can indicate the position of the cage.

As a preferred solution, in the above-mentioned cage-type throttle valve, the outer surface of the transparent cover is provided with an indicator plate.

As a preferred solution, in the above-mentioned cage type throttle valve, a set screw for fixing the position of the valve stem is installed on the valve cover, and the flow rate can be fixed after the position of the valve stem is fixed by the set screw.

As a preferred solution, in the above-mentioned cage type throttle valve, each row of throttle holes has four equally divided throttle holes, and the throttle holes between rows are interlaced with each other. The orifices overlap and gradually decrease.

The specific working process and principle of a cage type throttle valve provided by the present invention are as follows:

The fluid enters from the right inlet of the valve body, enters the longitudinal groove of the cylindrical frame through the gap of the copper wire, and then enters the cylindrical frame through the radial hole of the cylindrical frame. In this way, the gap between the copper wires is used to filter the fluid, which can reduce the cage The wear of the hole and the valve seat reduces the erosion of the fluid on the cage and the valve seat, and improves the service life of the cage throttle valve. And the spring in the valve seat makes the cage always press upwards on the valve stem. When the valve is closed, the cage and the valve seat will not collide, and the throttling is stable and the noise is small.

When throttling, turn the handwheel clockwise to drive the valve stem and cage down, the area of the orifice on the valve seat decreases gradually, and the flow rate gradually decreases until the cage closes the orifice. Turn the handwheel counterclockwise to drive the valve stem and cage to rise, the area of the orifice gradually increases, and the flow rate gradually increases until all the orifices are exposed and the flow rate is maximum. When the handwheel is turned and the specified flow rate is reached by observing the scale on the indicator plate, lock the set screw to fix the flow rate and achieve accurate flow control.

Beneficial effects: Compared with the prior art, a cage type throttle valve provided by the present invention has the following advantages:

The cage type throttle valve provided by the invention has reasonable structure design, stable operation, low noise, accurate flow control, good sealing performance, erosion resistance, wear resistance and long service life.

The throttle valve filters fluid through the gap between the cylindrical frame and the copper wire, which can realize the erosion resistance and wear resistance of the cage hole and the valve seat, and improve the service life of the throttle valve. The spring inside the valve seat keeps the cage pressed against the valve stem all the time. When the valve is closed, the cage and the valve seat will not collide, and the throttling is smooth, with low noise and precise flow control. The orderly arrangement of the throttle holes on the valve seat realizes the continuous and stable reduction of the flow rate when throttling.

Description of drawings

Fig. 1 is a schematic structural diagram of a cage-type throttle valve according to the present invention.

FIG. 2 is an enlarged structural schematic diagram of part I in FIG. 1 .

Figure 3 is a schematic diagram of the distribution of orifices on the valve seat.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

As shown in Figures 1 and 2, a cage-type throttle valve includes a valve body (14), a valve seat (15) installed in the valve body (14), and a valve seat (15) installed in the hole of the valve seat (15). The spring (13), the compression circle (11) and the valve body (14) are pressed on the valve seat (15) after being threaded, and the lower inner hole of the cage (7) is sleeved on the outer surface of the valve seat (15). On the circle, the upper inner hole of the cage (7) is set on the outer circle of the valve stem (5); the valve cover (6) is installed on the valve body (14) by bolts, and the valve cover (6) and the valve The rod (5) is threaded; the cylindrical filter bracket (17) is fixedly connected to the lower end of the valve cover (6), the transparent cover (4) is connected to the upper end of the valve cover (6), and the upper end of the valve stem (5) is connected to the handwheel (1) connection, the lower end of the valve stem (5) is connected with the cage (7), and the cage balance hole (71) on the cage (7) communicates with the valve stem balance hole (51) on the valve stem (5). Carbide bushing (16) is installed in the hole of cage cover (7);

The cylindrical filter holder (17) includes a cylindrical frame (8), an upper retaining ring (18), a lower retaining ring (10) and copper wires (9), and the upper retaining ring (18) and the lower retaining ring Rings (10) are installed on the cylindrical frame (8) respectively, and the upper retaining ring (18) and the lower retaining ring (10) are installed on the cylindrical frame (8) respectively, and the copper wires (9) are arranged in sequence to wind On the outside of the cylindrical frame (8), a cylindrical frame radial hole (81) and a cylindrical frame longitudinal groove (82) are provided on the outer circumference of the cylindrical frame (8);

Three rows of orifices are opened on the outer circle of the valve seat (15) near the axial center line.

In the cage-type throttle valve described above, the connection between the lower end of the bonnet (6) and the valve stem (5) is provided with a gasket (21), a metal sealing ring (20) and a stopper in sequence from top to bottom. Circle (19).

In the above-mentioned cage type throttle valve, an indicator nut (3) is installed on the upper part of the valve stem (5), and an indicator plate (2) is installed on the outer surface of the transparent cover (4).

In the cage type throttle valve mentioned above, the set screw (22) for fixing the position of the valve stem (5) is installed on the valve cover (6).

As shown in Figure 3, three rows of throttling holes are provided on the outer circle of the valve seat (15) near the axial centerline, and each row of throttling holes has four equally divided throttling holes. The orifices are staggered, and the orifices overlap and gradually decrease from top to bottom.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a cage type throttling valve, it is characterized in that, it comprises valve body (14), be arranged on the valve seat (15) in valve body (14), be arranged on the spring (13) in valve seat (15) hole, compressing after circle (11) is threaded connection with valve body (14) is pressed on valve seat (15), the lower inner hole sleeve of cage cover (7) is on the cylindrical of valve seat (15), and the upper inner hole sleeve of cage cover (7) is on the cylindrical of valve rod (5); Valve gap (6) is arranged on valve body (14) by bolt, and described valve gap (6) is threaded with valve rod (5); Cartridge filtration support (17) is fixedly connected with valve gap (6) lower end, transparent cover (4) is connected with valve gap (6) upper end, valve rod (5) upper end is connected with handwheel (1), valve rod (5) lower end is connected with cage cover (7), cage cover equalizing orifice (71) on cage cover (7) communicates with the valve rod equalizing orifice (51) on valve rod (5), is provided with cemented carbide lining (16) in described cage cover (7) hole;

Described cartridge filtration support (17) comprises tubular frame (8), upper ring washer (18), lower ring washer (10) and copper cash (9), described upper ring washer (18) and lower ring washer (10) are arranged on tubular frame (8) respectively, copper cash (9) is arranged in order the outside around tubular frame (8), tubular frame (8) cylindrical offers tubular frame radial hole (81) and tubular frame cannelure (82);

The cylindrical of described valve seat (15) offers three row throttle orifices near longitudinal center line.

2. a kind of cage type throttling valve according to claim 1, it is characterized in that, described valve gap (6) lower end and valve rod (5) joint, be provided with pad (21), metallic packing ring (20) and back-up ring (19) from top to bottom successively.

3. a kind of cage type throttling valve according to claim 1, is characterized in that, described valve rod (5) top is provided with instruction nut (3).

4. a kind of cage type throttling valve according to any one of claims 1 to 3, is characterized in that, the outer surface of described transparent cover (4) is provided with Pointing sign board (2).

5. a kind of cage type throttling valve according to claim 4, is characterized in that, described valve gap (6) is provided with the Cock screw (22) for fixing valve rod (5) position.

6. a kind of cage type throttling valve according to claim 4, is characterized in that, described often row throttle orifice has four decile throttle orifices, and between row and row, throttle orifice is interlaced, and throttle orifice is overlapping and progressively reduce from top to bottom.