CN103244691A - Internal pressure type bellows stop valve with switch display positions - Google Patents

Abstract

The invention relates to an internal pressure bellows stop valve with switch position display, which consists of a valve body, a lower valve stem, a bellows joint, a special metal bellows, a valve cover, an upper valve stem, steel balls, packing, and a gland Nuts etc. It is characterized in that: the two ends of the special metal bellows are respectively welded with the lower valve stem, the bellows joint and the inner port of the bonnet, and the bonnet and the valve body are welded between the valve body port and the bonnet after the thread is tightly fitted. . The lower valve stem forms a rolling connection with the upper valve stem through a steel ball, and the reverse cone of the upper valve stem and the inner step of the bonnet have an opening and termination reverse seal, and a packing sealing structure is added to form a special metal bellows when the valve is closed and opened. The internal pressure screen is open, the upper valve stem is reversed to the cone to terminate the reverse seal and the packing is guaranteed by the quadruple seal, the lower valve stem does not rotate in a straight line, and the bellows with high temperature, high pressure, and high safety and reliability can display the opening and closing positions. valve.

Description

Internal pressure bellows globe valve with switch position display

technical field

The invention relates to an opening and closing and control device for poisonous, radioactive or inflammable and explosive and other harmful media in various instrument (flow, differential pressure, pressure, liquid level, etc.) pipelines of industrial automation control systems and other industrial pipelines.

Background technique

The structure of the widely used globe valve is sealed by the upper packing to prevent external leakage. Due to the movement between the packing and the valve stem, inevitable friction and wear factors are generated, so there is a possibility of leakage in the structure. Some media (such as: high temperature, high pressure, poisonous, flammable, explosive, radioactive, etc. that cause harm to safety, environment and biological health) are not allowed to leak.

The current bellows globe valve in my country has a single structure and can only be used in the working conditions of low pressure, low temperature and safe medium, and has a short service life.

Contents of the invention

The object of the present invention is to provide an internal pressure bellows stop valve with switch position display, which is open and sealed with a special metal bellows, and the reverse cone of the upper valve stem and the inner step of the bonnet have an open-stop reverse seal and a packing seal structure. , to form a special metal bellows when the valve is closed and opened, the internal pressure screen is open, the upper valve stem is reversed to the cone to terminate the reverse seal and the packing is guaranteed by four seals, showing the position of opening and closing, and the lower valve stem does not rotate and moves linearly. Bellows globe valve with high temperature, high pressure, high safety and reliability performance.

Technical scheme of the present invention is:

An internal pressure bellows stop valve with switch position display, which is composed of valve body, lower valve stem, bellows joint, special metal bellows, valve cover, upper valve stem, steel ball, packing, gland nut, etc. . It is characterized in that one end of the special metal corrugation is welded with the lower valve stem step, the other end is welded with the bellows joint, a large steel ball is placed on the upper end of the lower valve stem, and the upper valve stem is inserted into the upper part of the lower valve stem to the large steel ball In contact with the bottom of the inner hole of the upper valve stem, a number of small steel balls of the same specification are placed from the side passage into the circular groove formed by the lower valve stem and the upper valve stem, so that the upper and lower valve stems are flexibly connected to form a valve. Ball bearing structure; it is placed inside the valve cover, the bellows joint is welded to the inner port of the valve cover, and a special metal bellows screen opening and sealing structure is implemented. The bonnet and body threads are tightly fitted and then welded between the bonnet and body ends. When the valve is opened, the upper valve stem rises, and its reverse cone closes with the inner step of the valve cover to form a stop back seal. Packing pads are placed on both sides of the packing in the inner cavity of the upper part of the valve cover, and the packing gland and butterfly spring are installed, and the gland nut is screwed in and compressed to form a packing sealing structure and lock the lock nut for positioning. A handle or handwheel, a flat washer and a nut are installed on the upper part of the upper valve stem, and the rotating handle or handwheel drives the upper valve stem to rotate to realize the opening and closing of the valve. The indicator sleeve is welded under the handle or handwheel, and the opening and closing marks are respectively engraved on the valve cover and its corresponding outer circle position, showing the opening and closing positions.

2. The two ends of the bonnet have external threads to cooperate with the valve body and the gland nut respectively. The hole at the lower end has an internal port, which extends to the depth and is an internal step, and then there is an internal thread to cooperate with the upper valve stem. It is a packing hole, and there are two lines engraved on the outside to indicate opening and closing.

3. The lower part of the lower valve stem is a valve core, the upper part has a step and a semicircular groove, and the center of the end part is a round pit for placing a large steel ball.

4. The inner wall of the lower hole of the upper valve stem has a semicircular groove for placing small steel balls, and the center of the semicircular groove has a channel for placing small steel balls to the outside, and the bottom of the hole cooperates with the large steel ball; There are reverse cones.

Advantage of the present invention and beneficial effect are:

1. The present invention adopts the pressure-pressed metal screen open seal and metal seal ring hard seal structure inside the special metal bellows, which has excellent and reliable high temperature and high pressure sealing performance, and has closed seal, open and terminated reverse seal and packing seal protection, realizing four Heavy sealing guarantee, especially suitable for high temperature, high pressure and media and occasions that are harmful to health, safety and environment.

2. The present invention adopts the steel ball combined ball bearing structure to flexibly connect the upper and lower valve stems, and the rotating upper valve stem drives the lower valve stem to move up and down in a straight line, which reduces the friction between the upper and lower valve stems and improves the control performance of the valve.

3. The invention ingeniously adopts the reverse sealing structure when the valve is opened and terminated, which effectively cuts off the upper flow of the medium and increases the sealing protection, limits the stroke of the valve switch, and greatly protects and improves the fatigue strength and service life of the bellows.

4. Can display the opening and closing positions.

Description of drawings

Figure 1 is a cross-sectional structure diagram of an internal pressure bellows stop valve with a switch position display.

Figure 2 is a cross-sectional view of the connection structure between the special metal bellows and the upper and lower valve stems.

Figure 3 is a bitmap of on and off.

In the figure: 1. Valve body 1-1, valve body port 2, lower valve stem 2-1, step 2-2, valve core 2-3, semi-circular groove 3, bellows joint 3-1 bellows joint end 4, Special metal bellows 5, bonnet 5-1, inner port 5-2, inner step 6, small steel ball 7, large steel ball 8, upper valve stem 8-1, reverse cone 8-2, channel 9, packing Pad 10, stuffing 11, lock nut 12, packing gland 13, butterfly washer 14, gland nut 15, indicator sleeve 16, handle or handwheel 17, washer 18, nut 19, opening score line 20, closing score line

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

An internal pressure bellows stop valve with switch position display, which consists of a valve body (1), a lower valve stem (2), a bellows joint (3), a special metal bellows (4), and a valve cover (5) , upper valve stem (8), packing (10), gland nut (14) and other components. It is characterized in that one end of the special metal bellows (4) is welded to the step (2-1) of the lower valve stem (2), the other end is welded to the bellows joint (3), and the upper end of the lower valve stem (2) Put a big steel ball (7), put the upper valve stem (8) into the upper part of the lower valve stem (2) until the big steel ball (7) touches the bottom of the inner hole of the upper valve stem (8), put a number of The small steel ball (6) is inserted into the circular groove formed by the lower valve stem (2) and the upper valve stem (8) from the side channel (8-2), so that the lower valve stem (2) and the upper valve stem (8) flexibly connected together to form a ball bearing structure. It is placed inside the bonnet (5), and the bellows joint end (3-1) is welded to the inner port (5-1) of the bonnet to form a special metal bellows (4) internal pressure screen open and sealed structure. The bonnet (5) and the valve body (1) are threaded tightly and welded between the bonnet (5) and the valve body port (1-1). When the valve is opened, the upper valve stem (8) rises, and its reverse cone (8-1) closes with the inner step (5-2) of the valve cover to form a stop back seal. There are packing pads (9) on both sides of the packing (10) respectively, which are placed in the inner cavity of the upper part of the valve cover (5), and the packing gland (12) and butterfly spring (13) are installed, and the gland nut (14) is screwed in and pressed. ), after forming the packing (10) sealing structure, lock the lock nut (11) for positioning. A handle or handwheel (16), a flat washer (17) and a nut (18) are installed on the upper part of the upper valve stem (8), and the rotating handle or handwheel (16) drives the upper valve stem (8) to rotate to realize the opening and closing of the valve. closure. Weld the indicator sleeve (15) under the handle or handwheel (16), and its end edge corresponds to the opening score line (19) and closing score line (20) engraved on the valve cover (5), showing the opening and closing Location.

2. The two ends of the bonnet (5) have external threads to cooperate with the valve body (1) and the gland nut (14) respectively, and the lower end hole has an inner port (5-1), and the extension to the depth is an inner step (5-2), then internal thread is arranged inwardly to cooperate with upper valve stem (8), and the top is a packing hole, and two lines representing opening (19) and closing (20) are engraved on the relevant positions on the outside.

3. The lower part of the lower valve stem (2) is the valve core (2-2), the upper part has a step (2-1) and a semicircular groove (2-3), and the center of the end part is a place for placing a large steel ball (7). round pit.

4. The inner wall of the lower hole of the upper valve stem (8) has a semicircular groove for placing a small steel ball (6), and the center of the semicircular groove has a channel (8-2) for placing a small steel ball (6) outward. The bottom of the bottom is matched with a large steel ball (7); there is a reverse cone (8-1) on the outside and adjacent to the thread.

Claims (5)

1. the internal pressure type bellows stop valve that shows of a belt switch position, it is made up of valve body (1), lower valve rod (2), corrugated pipe connector (3), special-purpose metal bellows (4), valve gap (5), upper valve rod (8), filler (10), gland nut (14) etc.It is characterized in that: weld with an end of special-purpose metal bellows (4) and the step (2-1) of lower valve rod (2), the other end and corrugated pipe connector (3) welding, a big steel ball (7) is put in the upper end portion of lower valve rod (2), upper valve rod (8) is inserted in lower valve rod (2) top to big steel ball (7) and contacts with at the bottom of upper valve rod (8) endoporus, with the small ball (6) of some quantity same sizes from the side passage (8-2) be presented in the circular groove that lower valve rod (2) and upper valve rod (8) form mutually, lower valve rod (2) and upper valve rod (8) are coupled together actively are combined into ball bearing structure; Be placed on valve gap (5) inside, corrugated pipe connector end (3-1) and valve gap inner port (5-1) welding form the spacious sealing configuration of special-purpose metal bellows (4) internal pressure type screen; Welding between valve gap (5) and valve body port (1-1) after valve gap (5) and valve body (1) screw thread closely cooperate; When opening valve, upper valve rod (8) rises, and interior step (5-2) closure of its reverse circular cone (8-1) and valve gap (5) forms and stops back seal.

2. according to the apparent internal pressure type bellows stop valve in the described belt switch of claim 1 position, it is characterized in that: the two ends of described valve gap (5) have outside thread to cooperate with valve body (1) and gland nut (14) respectively, there is inner port (5-1) in following stomidium portion, prolonging liter to the degree of depth is interior step (5-2), inwardly there is internal thread to cooperate with upper valve rod (8) again, top is stuffing hole, is carved with the lines that two expressions are opened (19) and closed (20) on the relevant position of the outside.

3. according to the apparent internal pressure type bellows stop valve in the described belt switch of claim 1 position, it is characterized in that: the bottom of described lower valve rod (2) is spool (2-2), and step (2-1) and half slot (2-3) are arranged at top, and the center, end is the round pool of settling big steel ball (7).

4. according to the apparent internal pressure type bellows stop valve in the described belt switch of claim 1 position, it is characterized in that: the lower hole inwall of described upper valve rod (8) has the half slot of laying small ball (6), the center of half slot has a passage (8-2) of laying small ball (6) laterally, and the bottom in hole cooperates with big steel ball (7); Outside have reverse circular cone (8-1) with the screw thread adjacent.

5. according to the apparent internal pressure type bellows stop valve in the described belt switch of claim 1 position, it is characterized in that: at handle or handwheel (16) below welding indication cover (15), the unlatching groove (19) that is carved with on its sideline, end and the valve gap (5) and to close groove (20) corresponding shows the position of opening and closing.

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