CN205639623U - Low discharge single seat governing valve - Google Patents

Abstract

A small-flow single-seat regulating valve, which belongs to the field of industrial control, includes a valve body, a valve cover, a valve seat and a mandrel. There is a cavity, the mandrel passes through the valve cover and the valve seat, and is placed in the valve body. The valve seat includes a seat base, a soft seat cover, a soft seat and a seat retainer, and the valve body and seat retainer Thread structures are provided on the intersecting surfaces, and the threads of the valve body and the pressure ring of the valve seat match each other; the head of the mandrel is provided with a V-shaped cutout. This technical solution adopts the V-shaped notch on the head of the mandrel and the flow section formed by the soft valve seat to adjust the delivery of the flow, ensure the accuracy of the section, reduce the influence of gap flow, and ensure good adjustment accuracy.

Description

A small flow single-seat regulating valve

technical field

The utility model relates to a valve, in particular to a small-flow single-seat regulating valve, which belongs to the field of industrial control.

Background technique

Small flow regulating valves are usually used for precise control of small flow of toxic, corrosive, flammable and explosive media, and are also used in scientific research such as laboratories. Traditional small flow control valves are also called needle valves because they mostly use needles to control flow. This kind of small flow regulating valve has high requirements on precision and sealing performance. However, the current domestic small flow regulating valves generally have the defect of easy leakage and poor sealing performance in the actual use process. Moreover, the shape of the needle is difficult to have good machining accuracy, and its flow characteristics are difficult to guarantee, resulting in the precise control of small flow has always been a domestic problem.

Utility model content

In order to overcome the technical defects, the utility model aims to provide a small flow regulating valve with good sealing performance, accurate flow coefficient and high regulating precision.

In order to achieve the above object, the utility model adopts the following technical solutions:

A small-flow single-seat regulating valve, including a valve body, a valve cover, a valve seat and a mandrel. The shaft passes through the bonnet and the valve seat and is placed in the valve body; the valve seat includes a seat base, a soft seat cover, a soft seat and a seat pressure ring, and the seat base, a soft seat cover, a soft valve The seats are placed in the valve body in turn, and are pressed tightly on the valve body by the seat pressure ring; the intersecting side of the valve body and the valve seat pressure ring is provided with a thread structure, and the threads of the valve body and the valve seat pressure ring match each other; The head of the mandrel has a V-shaped cut.

Further, a sealing structure is provided between the valve seat base and the valve body, between the mandrel and the soft valve seat cover.

Further, the V-shaped cutout on the head of the mandrel and the soft valve seat constitute a flow section.

Further, a valve cover gasket is provided between the valve cover and the valve body, and a stuffing box is provided between the top of the valve cover and the mandrel.

Due to the application of the above-mentioned technical solutions, the utility model has the following advantages:

Compared with the existing small-flow single-seat regulating valve, the utility model adopts the flow cross-section formed by the V-shaped incision of the head of the mandrel and the soft valve seat to adjust the delivery of the flow, so as to ensure the accuracy of the cross-section and reduce the gap flow. influence, to ensure good adjustment accuracy.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Fig. 2 is a schematic structural view of the mandrel in Fig. 1 .

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment: see shown in Fig. 1 and Fig. 2:

A small-flow single-seat regulating valve, including a valve body 1, a valve cover 2, a valve seat 3 and a mandrel 4, the valve cover 2 is installed above the valve body 1 and fixed with a full-wire stud 6 and a large hex nut 7, The valve body 1 is provided with a mold cavity, and the mandrel 4 passes through the valve cover 2 and the valve seat 3 and is placed in the valve body 1 . The valve seat 3 includes a valve seat base 3a, a soft valve seat cover 3b, a soft valve seat 3c and a valve seat pressure ring 3d, and the valve seat base 3a, the soft valve seat cover 3b, and the soft valve seat 3c are placed in the valve body in sequence 1, and pressed on the valve body 1 with the valve seat pressure ring 3d. Wherein: the intersecting surface of the valve body 1 and the valve seat pressure ring 3d is provided with a threaded structure, and the threads of the valve body 1 and the valve seat pressure ring 3d match each other. The head of the mandrel 4 has a V-shaped cutout, as shown in Figure 2, its A-A' section is triangular, and the B-B' section is fan-shaped. Among them, the V-shaped notch on the head of the mandrel 4 and the soft valve seat 3c form a flow cross-section, which ensures the accuracy of the cross-section, reduces the influence of gap flow, and ensures good adjustment accuracy. The calculated cut shape has precise flow characteristics and has great High adjustment accuracy.

In order to strengthen the sealing performance of the whole small-flow single-seat regulating valve, sealing structures are provided between the valve seat base 3a and the valve body 1, between the mandrel 4 and the soft valve seat cover 3b, so that the valve has a good seal when it is closed Performance; a bonnet gasket 5 is provided between the bonnet 2 and the valve body 1 to prevent the medium from flowing out; a stuffing box 8 is provided between the top of the bonnet 2 and the mandrel 4 to prevent the medium from leaking out. Due to frequent friction between the soft valve seat 3c and the mandrel 4, the soft valve seat 3c is made of polytetrafluoroethylene, so as to tightly wrap the mandrel 4.

This technical solution adopts the flow section formed by the V-shaped cutout of the head of the mandrel and the soft valve seat to adjust the flow delivery, ensure the accuracy of the section, reduce the influence of gap flow, ensure good adjustment accuracy, and solve the existing problems. The defect of poor sealing performance in the technology that is easy to leak.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the utility model shall be covered within the protection scope of the utility model.

Claims (4)

1. A small-flow single-seat regulating valve, including a valve body (1), a valve cover (2), a valve seat (3) and a mandrel (4), the valve cover (2) is installed above the valve body (1) and Use all-wire studs (6) and large hexagonal nuts (7) to fix, the valve body (1) is provided with a cavity, the mandrel (4) passes through the valve cover (2) and valve seat (3), and places Inside the valve body (1); it is characterized in that the valve seat (3) includes a valve seat base (3a), a soft valve seat cover (3b), a soft valve seat (3c) and a valve seat retainer (3d), Seat base (3a), soft seat cover (3b), and soft seat (3c) are placed in the valve body (1) in sequence, and pressed tightly on the valve body (1) by the seat retainer ring (3d) ; The side where the valve body (1) intersects with the valve seat pressure ring (3d) is provided with a threaded structure, and the threads of the valve body (1) and the valve seat pressure ring (3d) match each other; the mandrel (4) The head has a V-shaped incision. 2. The small-flow single-seat regulating valve according to claim 1, characterized in that, the V-shaped cutout on the head of the mandrel (4) and the soft valve seat (3c) form a flow section. 3. The small-flow single-seat regulating valve according to claim 1, characterized in that, between the seat base (3a) and the valve body (1), between the mandrel (4) and the soft seat cover (3b) There is a sealing structure between them. 4. The small-flow single-seat regulating valve according to claim 1, 2 or 3, characterized in that a valve cover gasket (5) is provided between the valve cover (2) and the valve body (1), and is located on the valve cover (2) A stuffing box (8) is arranged between the upper part and the mandrel (4).