Small-caliber wedge-type double-gate-plate gate valve gate plate

Abstract

A small-caliber wedge type double-gate-plate gate valve gate plate comprises a left gate plate, a right gate plate and a gate plate middle body, the inner side of the left gate plate and the inner side of the right gate plate are designed to be of a mortise structure, protruding blocks are symmetrically arranged on the outer edge of a mortise, and a disc spring is assembled in the mortise. Protruding blocks are symmetrically arranged on the inner side of a center hole of the flashboard middle body, grooves are formed between the protruding blocks in the axial direction, and the protruding blocks are buckled with the grooves so that the left flashboard, the right flashboard and the flashboard middle body can be connected into a whole. The flashboard guide sleeve is installed in a center hole of the flashboard middle body, and the outer side face of the flashboard guide sleeve makes contact with the disc spring. The whole flashboard is divided into the left flashboard, the right flashboard and the flashboard middle body, and the left flashboard, the right flashboard and the flashboard middle body adjust the processing angle gap of the flashboard gate valve body and the gear width of the combined flashboard under the action of pretightening force of the belleville spring, so that the flashboard enters the sealing surface of the valve body to be in contact with the sealing surface of the valve body to achieve the sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, specifically to a small-diameter wedge-type double gate valve gate. Background Art

[0002] For small-diameter wedge gate valves, since the gates are all rigid and have a single solid structure, they primarily provide a forced seal when closed. They cannot compensate for changes in valve seat alignment caused by pipeline loads or thermal fluctuations. The wedge angles on both sealing surfaces require very high machining precision, making manufacturing and maintenance difficult. Wear easily occurs between the sealing surfaces during operation, and the gate can easily wedge due to temperature changes. The rigid gate structure is as follows: Figure 6 As shown.

[0003] Because the gate of a small-diameter wedge gate valve is a single piece without elastic deformation, there is an angular error in the wedge angle of the sealing surface between the gate and the valve body during processing, which creates a gap between the two and causes valve sealing leakage. This leakage is difficult for operators to control based on their practical experience in the processing process. Utility Model Content

[0004] This utility model provides a small-diameter wedge-type double gate valve gate, where the gate plate contacts a disc spring via the outer side of the gate plate guide sleeve. The left and right gate plates and the gate plate body are adjusted by the preload of the disc spring to change the width of the combined gate plate, allowing the gate plate to enter and contact the valve body sealing surface, achieving a sealing effect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A small-diameter wedge-type double gate valve includes left and right gate plates and a gate plate body. The inner sides of the left and right gate plates are designed with a tenon and groove structure, and the outer edges of the tenons and grooves are symmetrically provided with protrusions. Disc springs are installed in the tenons and grooves. The center hole of the gate plate body is symmetrically provided with protrusions on the inner side. The protrusions form grooves axially. The protrusions and grooves are engaged to connect the left and right gate plates and the gate plate body into one piece. The gate plate guide sleeve is installed in the center hole of the gate plate body, and the outer side of the gate plate guide sleeve is in contact with the disc springs.

[0007] The groove is equipped with a limiting pin.

[0008] After the gate body and the gate guide sleeve are assembled, their end faces form a whole 5° inclined surface.

[0009] The gate guide sleeve consists of a fixed mandrel at the upper end and a body at the lower end, with a guide sleeve hole on the body; the fixed mandrel passes through the upper hole of the gate body and is tightly fitted with the fixed mandrel hole on the lower end face of the valve stem.

[0010] The lower end of the valve stem is provided with an external thread. After the external thread is fitted with the upper hole thread of the gate plate, the positioning pin passes through the valve stem positioning hole at the lower end of the valve stem and the middle body positioning hole on the gate plate to connect the two. The valve stem positioning hole is located above the bottom of the fixed mandrel hole.

[0011] This invention disassembles the overall gate into left and right gates and a gate body. Under the preload of the butterfly springs, the left and right gates and the gate body adjust the machining angle clearance and the width of the combined gate, ensuring the gate enters and contacts the valve body sealing surface to achieve a sealing effect. Furthermore, due to the preload of the butterfly springs, the gate will not become wedged due to temperature changes. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the main structure of the gate in this practical application;

[0014] Figure 3 This is a schematic diagram of the left and right gate structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the guide sleeve structure of the gate plate in this practical application;

[0016] Figure 5 This is a schematic diagram of a partial structure of the valve stem in this practical application;

[0017] Figure 6 This is a schematic diagram of the structure of an existing rigid gate. DETAILED DESCRIPTION

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figure 1-5 A small-diameter wedge-type double gate valve includes left and right gate plates 1 and a gate plate body 2. The inner side of the left and right gate plates 1 is designed with a tenon and groove structure, and the outer edge of the tenon and groove is symmetrically provided with protrusions 1-1. A disc spring 3 is installed in the tenon and groove. The center hole of the gate plate body 2 is symmetrically provided with protrusions on the inner side. The protrusions form a groove 2-2 in the axial direction. The protrusions 1-1 and the groove 2-2 are fastened together (the protrusions 1-1 enter from the notch formed between the protrusions on the inner side of the center hole of the gate plate body 2 and are then rotated and fastened in the groove 2-2) to fasten the left and right gate plates 1 and the gate plate body 2 into one piece. The gate plate guide sleeve 5 is installed in the center hole of the gate plate body 2, and the outer side of the gate plate guide sleeve 5 is in contact with the disc spring 3.

[0020] The convex surface of the tenon groove of the left and right gate plates 1 extends to the inner hole 5-2 of the gate plate guide sleeve, which serves as a guide.

[0021] The left and right gate plates 1 and the gate body 2, under the preload of the disc spring 3, adjust the width of the combined gate plate, allowing the gate plate to enter and contact the valve body sealing surface to achieve a sealing effect. When the gate plate sealing surface is worn, a shim can be added in the tenon groove for compensation, facilitating maintenance.

[0022] The groove 2-2 is provided with a limiting pin 2-3 to prevent the protrusions 1-1 on the left and right gate plates 1 from going out of the groove 2-2 and exiting from the gap between the protrusions in the gate plate body 2 during rotational engagement.

[0023] After the gate body 2 and the gate guide sleeve 5 are assembled, their end faces form a 5° inclined surface. The 5° inclined surface of the gate body and the gate guide sleeve is used to connect the left and right gates 1 to form a wedge-shaped gate.

[0024] The gate guide sleeve 5 consists of a fixed mandrel 5-1 at the upper end and a lower body. The body has a guide sleeve hole 5-2. The fixed mandrel 5-1 passes through the upper hole 2-1 of the gate body 2 and the fixed mandrel hole 6-2 on the lower end face of the valve stem 6, ensuring a tight fit. This ensures that the fixed gate guide sleeve 5, the gate body 2, and the valve stem 6 are coaxial.

[0025] The lower end of the valve stem 6 is provided with an external thread. After the external thread is threaded into the upper hole 2-1 of the gate body 2, the positioning pin 4 passes through the valve stem positioning hole 6-1 at the lower end of the valve stem 6 and the middle body positioning hole 2-4 on the gate body 2 to connect the two. The positioning hole 6-1 is located above the bottom of the fixed spindle hole 6-2. This prevents the valve stem from rotating without raising the gate, thus causing the valve opening and closing function to fail.

Claims

1. A small-diameter wedge-type double-gate valve gate, comprising left and right gate plates (1) and a gate plate body (2), characterized in that, The inner side of the left and right gate plates (1) is designed with a tenon and groove structure. The outer edge of the tenon and groove is symmetrically provided with protrusions (1-1). The tenon and groove are fitted with disc springs (3). The center hole of the gate plate body (2) is symmetrically provided with protrusions on the inner side. The protrusions form grooves (2-2) in the axial direction. The protrusions (1-1) and the grooves (2-2) are fastened together to connect the left and right gate plates (1) and the gate plate body (2) into one unit. The gate plate guide sleeve (5) is installed in the center hole of the gate plate body (2). The outer side of the gate plate guide sleeve (5) is in contact with the disc springs (3).

2. The gate of a small-diameter wedge-type double-gate valve according to claim 1, characterized in that, The groove (2-2) is provided with a limiting pin (2-3).

3. The gate of a small-diameter wedge-type double-gate valve according to claim 1, characterized in that, After the gate body (2) and the gate guide sleeve (5) are assembled, their end faces form an integral 5° inclined surface.

4. The gate of a small-diameter wedge-type double-gate valve according to claim 1, characterized in that, The gate guide sleeve (5) consists of a fixed spindle (5-1) at the upper end and a body at the lower end. A guide sleeve hole (5-2) is opened on the body. The fixed spindle (5-1) passes through the upper hole (2-1) of the gate body (2) and the fixed spindle hole (6-2) on the lower end face of the valve stem (6) and fits tightly.

5. The gate of a small-diameter wedge-type double-gate valve according to claim 4, characterized in that, The lower end of the valve stem (6) is provided with an external thread. After the external thread is threaded and the upper hole (2-1) of the gate body (2) is threaded, the positioning pin (4) passes through the valve stem positioning hole (6-1) at the lower end of the valve stem (6) and the middle body positioning hole (2-4) on the gate body (2) to connect the two. The valve stem positioning hole (6-1) is located above the bottom of the fixed spindle hole (6-2).

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