CN104896111B - A kind of pilot piston type stop valve for adapting to vertical duct - Google Patents

Abstract

The invention discloses a pilot piston type shut-off valve suitable for vertical pipelines, which comprises a valve body upper cover, a valve body middle sleeve, a valve body lower cover, a piston valve core, a valve seat, a pilot valve and a buffer sleeve. The upper cover of the valve body, the middle sleeve of the valve body, and the lower cover of the valve body are connected sequentially from top to bottom. A guide sleeve is installed inside the middle sleeve of the valve body. cloth setting; the piston valve core is installed with a spring and a buffer sleeve, the spring is located at the upper end of the buffer sleeve; The valve core cover is connected with the pilot valve through the pilot pipe; the bottom of the valve body lower cover is provided with a water inlet, and the top of the valve body upper cover is provided with a water outlet. The invention adopts a piston-type valve core, which is vertically built into the valve body, which solves the problem that such pilot-operated shut-off valves cannot be used vertically, and expands the applicable scope of such shut-off valves.

Description

A Pilot Piston Type Globe Valve Adapted to Vertical Pipeline

【Technical field】

The invention relates to the technical field of shut-off valves, in particular to the technical field of pilot piston type shut-off valves suitable for vertical pipelines.

【Background technique】

The globe valve is an indispensable control element in the pipeline of the process industry, which is used to control the on-off of the fluid in the pipeline. At present, there are mainly two control methods for the opening and closing of globe valves: mechanical manual rotation and electric control. The opening and closing of mechanical manual rotary globe valves is slow; due to the complicated structure of electric globe valves, the volume increases and the cost increases. In order to avoid the above disadvantages, a pilot-operated stop valve was invented. The existing pilot piston type stop valve controls the opening and closing of the pilot valve and utilizes fluid pressure, piston gravity and spring force to realize the opening and closing of the main valve, which can realize the function of a small valve controlling a large valve and has a certain energy-saving effect. Due to the limitation of this type of valve on the size of the valve and the instability of the spring itself, the design of this type of valve should not rely too much on the spring, that is, the self-gravity of the piston plays a greater role when the valve is closed. In order to ensure that the direction of piston movement is vertical, existing valves of this type can only be installed in horizontal pipelines, and cannot be used in vertical or inclined pipelines.

In the existing pilot-operated globe valves, the valve control part is generally placed outside the pipeline, and the control of the pilot valve generally adopts manual, electric, hydraulic and linkage driving methods, among which the speed of manual control is slow and the degree of automation is not high. However, the other methods have the disadvantages of complicated mechanism and high energy consumption.

【Content of invention】

The purpose of the present invention is to solve the problems in the prior art, and propose a pilot piston stop valve suitable for vertical pipelines, which can maintain the vertical movement of the piston when installed in pipelines with different angles, and prevent the piston from passing through the guide sleeve. More friction, improve energy saving efficiency, has the advantages of simple mechanism, cost saving and energy consumption reduction.

In order to achieve the above object, the present invention proposes a pilot piston type shut-off valve suitable for vertical pipelines, including a valve body upper cover, a valve body middle sleeve, a valve body lower cover, a piston valve core, a valve seat, a pilot valve and a buffer The upper cover of the valve body, the middle sleeve of the valve body, and the lower cover of the valve body are connected sequentially from top to bottom. A guide sleeve is installed inside the middle sleeve of the valve body, and the guide sleeve is connected with the piston valve core through ribs. The ribs are evenly distributed in the radial direction; the piston valve core is equipped with a spring and a buffer sleeve, and the spring is located at the upper end of the buffer sleeve; the pilot valve is installed on one side of the upper cover of the valve body, and the piston valve is installed on the upper part of the guide sleeve. The core cover, the piston type spool cover is connected with the pilot valve through the pilot pipe; the bottom of the valve body lower cover is provided with a water inlet, and the top of the valve body upper cover is provided with a water outlet.

Preferably, the piston valve core is always in a vertical state in the guide sleeve, and there is a hard seal between the piston valve core and the valve seat.

Preferably, the piston valve core and the guide sleeve are placed inside the middle sleeve of the valve body.

Preferably, a small hole is opened at the bottom of the piston valve core, and the water inlet and the water outlet are connected to the pilot valve through the small hole.

Preferably, a threaded hole is opened in the center of the piston-type valve core cover, and a thin tube is installed on the threaded hole of the piston-type valve core cover, and the piston-type valve core cover is connected with the pilot valve through the thin tube.

Preferably, a pressure plate is installed inside the piston-type spool cover, and the pressure plate is located between the spring and the buffer sleeve.

Preferably, a limit cover is installed on the pressure plate, and the buffer sleeve is connected with the limit cover.

Beneficial effects of the present invention: the present invention adopts a piston-type valve core and is vertically built into the valve body, which solves the problem that such pilot-operated shut-off valves cannot be used vertically, and expands the scope of application of such shut-off valves. By changing the size parameters of the rib plate in the middle sleeve, the position and posture of the guide sleeve and the piston valve core inside the valve body can be changed, so that the vertical movement of the piston can be maintained when installed in pipelines with different angles, and the piston itself can be fully utilized. Gravity, to avoid excessive friction between the piston and the guide sleeve, improve energy saving efficiency. The pressure difference generated when the fluid inside the valve flows through the small hole at the piston spool is used as the power to open the valve, and the pressure difference is controlled by the opening and closing of the pilot valve to control the opening and closing of the main valve. It is suitable for high-pressure pipeline systems with large pipe diameters, and has the advantages of simple mechanism, cost saving and energy consumption reduction.

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

【Description of drawings】

Fig. 1 is a schematic cross-sectional view of a pilot piston type shut-off valve adapted to vertical pipelines according to the present invention.

In the figure: 1-valve body upper cover, 2-spring, 3-piston spool cover, 4-limit cover, 5-press plate, 6-piston spool, 7-buffer sleeve, 8-guiding sleeve, 9 - middle sleeve of valve body, 10 - small hole, 11 - valve seat, 12 - lower cover of valve body, 13 - pilot pipe, 14 - pilot valve, 15 - rib plate.

P1-the pressure of the water inlet at the lower end of the valve, P2-the pressure inside the piston spool, and P3-the pressure at the water outlet at the upper end of the valve.

【detailed description】

Referring to Fig. 1, the present invention includes a valve body upper cover 1, a valve body middle cover 9, a valve body lower cover 12, a piston valve core 6, a valve seat 11, a pilot valve 14 and a buffer sleeve 7, and the valve body upper cover 1. The middle sleeve 9 of the valve body and the lower cover 12 of the valve body are connected sequentially from top to bottom. The inner sleeve 9 of the valve body is equipped with a guide sleeve 8, and the guide sleeve 8 is connected with the piston valve core 6 through the rib plate 15. Ribs 15 are radially and evenly distributed; spring 2 and buffer sleeve 7 are installed in the piston valve core 6, and spring 2 is located at the upper end of buffer sleeve 7; the pilot valve 14 is installed on one side of the upper cover 1 of the valve body, Piston-type spool cover 3 is installed on the top of guide sleeve 8, and piston-type spool cover 3 is connected with pilot valve 14 through pilot pipe 13; There is a water outlet.

The piston spool 6 is always in a vertical state in the guide sleeve 8, and the piston spool 6 and the valve seat 11 are hard-sealed. The piston valve core 6 and the guide sleeve 8 are all placed inside the middle sleeve 9 of the valve body. The bottom of the piston spool 6 is provided with a small hole 10 , and the water inlet and water outlet communicate with the pilot valve 14 through the small hole 10 . The central part of the piston type spool cover 3 has a threaded hole, and a thin tube is installed on the threaded hole of the piston type spool cover 3, and the piston type spool cover 3 is connected with the pilot valve 14 through the thin tube. A pressure plate 5 is installed inside the piston type valve core cover 3 , and the pressure plate 5 is located between the spring 2 and the buffer sleeve 7 . The limiting cover 4 is installed on the pressing plate 5 , and the buffer sleeve 7 is connected with the limiting cover 4 .

Working process of the present invention:

In the working process of a pilot piston type shut-off valve suitable for vertical pipelines of the present invention, the guide sleeve 8 is used to limit the position of the piston type valve core 6; the upper end of the piston type valve core cover 3 is sealed by the upper cover 1 of the valve body and is sealed by The pipeline is connected to the pilot valve 14; the pilot valve 14 can control the communication between the piston spool 6 and the water outlet on the upper part of the valve body, and then control the movement of the piston to realize the opening and closing of the main valve.

When the pilot valve 14 is closed, the pressure P2 inside the piston spool is the same as the pressure P1 at the water inlet at the lower end of the valve. The main valve is closed. When the pilot valve 14 is opened, the pressure P2 inside the piston spool decreases, and tends to the pressure P3 at the water outlet at the upper end of the valve. Since the pressure P2 inside the piston spool is less than the pressure P1 at the water inlet at the lower end of the valve, the piston spool 6 It is lifted by the pressure difference to realize the opening of the main valve. Regardless of the angle of the pipeline, as long as the angle of the rib plate 15 on the middle sleeve 9 of the valve is adjusted accordingly, the guide sleeve 8 and the piston spool 6 can always be in a vertical position, thereby ensuring the normal movement of the piston spool 6 and the normal movement of the main valve. opening and closing.

In the present invention, the pressure difference generated when the internal fluid of the valve flows through the small hole 10 of the piston valve core 6 is used as the power to open the valve, and the opening and closing of the pilot valve 14 is used to control the rise and fall of the pressure difference, and then control the opening and closing of the main valve. close. It is suitable for high-pressure pipeline systems with large pipe diameters, and has the advantages of simple mechanism, cost saving and energy consumption reduction.

The guide sleeve 8 is fixed inside the middle sleeve 9 of the valve body with the rib plate 15 structure, and then parts such as the valve body upper cover 1, the piston valve core 6, and the conduit are installed on the guide sleeve 8. The rib plate 15 structure of the middle sleeve 9 of the valve body makes the main parts of the valve, the piston spool 6 and the piston spool cover 3, etc. independently located inside the pipeline. By changing the size parameters of the middle sleeve rib 15, the guide sleeve 8 and the The position and posture of the piston spool 6 inside the middle sleeve 9 of the valve body can realize the vertical movement of the piston when installed in pipelines with different angles, make full use of the gravity of the piston itself, and avoid the piston spool 6 and the guide sleeve. 8 Excessive friction, improve energy saving efficiency.

The above-mentioned embodiment is an illustration of the present invention, not a limitation of the present invention, and any solution after a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (5)

1. A pilot piston type stop valve adapted to vertical pipelines, characterized in that it includes a valve body upper cover (1), a valve body middle sleeve (9), a valve body lower cover (12), a piston valve core (6 ), valve seat (11), pilot valve (14) and buffer sleeve (7), the valve body upper cover (1), valve body middle sleeve (9), valve body lower cover (12) from top to bottom The inner sleeve (9) of the valve body is equipped with a guide sleeve (8), and the guide sleeve (8) is connected with the piston valve core (6) through the rib plate (15), and the rib plate (15) is radially uniform cloth setting; the piston spool (6) is equipped with a spring (2) and a buffer sleeve (7), and the spring (2) is located at the upper end of the buffer sleeve (7); the pilot valve (14) is installed on the valve body On one side of the cover (1), a piston type spool cover (3) is installed on the upper part of the guide sleeve (8), and the piston type spool cover (3) is connected with the pilot valve (14) through the pilot pipe (13); The bottom of the valve body lower cover (12) is provided with a water inlet, and the top of the valve body upper cover (1) is provided with a water outlet. The piston type spool (6) is always in a vertical state in the guide sleeve (8), and the piston type There is a hard seal between the valve core (6) and the valve seat (11), and the piston type valve core (6) and the guide sleeve (8) are all placed inside the middle sleeve (9) of the valve body. 2. A pilot piston type shut-off valve adapted to vertical pipelines according to claim 1, characterized in that: a small hole (10) is opened at the bottom of the piston type spool (6), and the water inlet and the water outlet pass through The small hole (10) communicates with the pilot valve (14). 3. A pilot piston type shut-off valve adapted to vertical pipelines according to claim 1, characterized in that: the center of the piston type valve core cover (3) has a threaded hole, and the piston type valve core cover (3) ) threaded hole is equipped with a thin tube, and the piston valve core cover (3) is connected with the pilot valve (14) through the thin tube. 4. A pilot piston type shut-off valve adapted to vertical pipelines according to claim 1, characterized in that: a pressure plate (5) is installed in the piston type valve core cover (3), and the pressure plate (5) is located on the spring (2) and buffer sleeve (7). 5. A pilot piston type shut-off valve adapted to vertical pipelines according to claim 4, characterized in that: a limit cover (4), a buffer sleeve (7) and a limit cover are installed on the pressure plate (5) (4) connected.