CN206478241U - The double scraper two-way hard seal spiral valves of piston type - Google Patents

Abstract

The utility model discloses a piston-type double-scraper two-way hard-sealed rotary ball valve, which comprises a valve body, a valve seat, an upper valve stem, a lower valve stem and a valve core. The angle between the valve seat and the valve body is provided with a first sealing ring, the valve seat is provided with a concave part on the side close to the valve body, and the valve seat is detachably fixedly connected to the sealing surface of the valve seat There is a retaining ring, a step is set on the valve body near the top of the valve body, a shoulder matching the step is set on the upper valve stem, and a stuffing cover is set in the valve body above the shoulder and close to the top of the valve body. Several packing rings are arranged in the cover, and the end of the lower valve stem near the valve seat is provided with a spherical surface. The two-way seal is guaranteed by the cooperation between the valve seat and the first sealing ring and the cooperation between the valve seat and the valve body near the recessed part. The contact between the valve core and the valve seat forms an included angle of 90° with respect to the surface of the valve seat to form a double scraper, which can Remove the fouling on the spool during use.

Description

Piston type double scraper two-way hard seal rotary ball valve

technical field

The utility model relates to a piston-type double-scraper two-way hard-seal rotary ball valve.

Background technique

At present, the triple eccentric multi-layer butterfly valve is commonly used in the market, but the reverse pressure bearing capacity of this valve is relatively poor, so it is thought of using a rotary ball valve. The rotary ball valve has the functions and advantages of butterfly valve, hemispherical valve, gate valve and globe valve at the same time, and has its own completely unique powerful functions and advantages. The rotary ball valve can not only shut off reliably under positive pressure, but It can also be reliably shut off when the pressure or reverse pressure is much greater than the forward pressure. However, the existing rotary ball valve is used for a long time, the friction of the valve stem increases, the surface of the valve core is easy to scale, and the valve seal is easy to wear, which will affect the opening and closing and sealing of the valve.

Utility model content

The purpose of this utility model is to solve the problems that the existing rotary ball valve is used for a long time, the friction force of the valve stem increases, the surface of the valve core is easy to scale, and the valve seal is easy to wear, and provides a valve that adapts to the requirements of the pipe network system and can be used in complex engineering. A rotary ball valve that can be used under certain conditions.

The technical solution adopted in the utility model is: a piston-type double-scraper two-way hard-sealed rotary ball valve, including a valve body, a valve seat, an upper valve stem, a lower valve stem and a valve core. The surface forms an included angle of 90°. A first sealing ring is provided between the valve seat and the valve body. The valve seat is provided with a concave portion on the side close to the valve body. The detachable fixed connection has a retaining ring, and the retaining ring is provided with a number of recesses on the surface facing the valve core to make the surface in a zigzag shape, a step is provided on the valve body near the top of the valve body, and a step is provided on the upper valve stem. The matching shoulder, the valve body above the shoulder and close to the top of the valve body is provided with a packing cover, and several packing rings are provided in the packing cover, and the end of the lower valve stem near the valve seat is provided with a spherical surface. The valve seat is provided with a self-lubricating adjusting pad in contact with the spherical surface of the lower valve stem, and a composite coating is provided on the surface of the self-lubricating adjusting pad facing the spherical surface of the valve stem. A second sealing ring that fits the upper and lower stems.

As a further improvement of the utility model, the valve seat is connected with the valve body through a spring.

The beneficial effect of the utility model is: after adopting this structure, the two-way sealing is guaranteed through the cooperation between the valve seat and the first sealing ring and the cooperation between the valve seat and the valve body, and the contact between the valve core and the valve seat is relatively The surface of the valve seat forms a 90° included angle to form a double scraper, which can cut off the fouling on the valve core during use. The opening and closing resistance of the valve is small, the sealing performance is good, and the reliability is high.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Figure 2 is an enlarged view of A.

Figure 3 is an enlarged view of B.

Figure 4 is an enlarged view at point C.

Figure 5 is an enlarged view at D.

Fig. 6 is an enlarged view of the valve body near the stuffing cap in the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

Embodiment 1: Piston-type double-scraper two-way hard-sealed rotary ball valve, including valve body 1, valve seat 2, upper valve stem 3, lower valve stem 4 and valve core 5, the contact between the valve core and the valve seat is opposite to the valve seat The surface forms an included angle of 90°. A first sealing ring 6 is arranged between the valve seat and the valve body. The valve seat is provided with a concave portion 7 on the side close to the valve body. A retaining ring 8 is detachably fixedly connected to the surface of the retaining ring. There are several recesses on the surface of the retaining ring facing the valve core so that the surface is in a zigzag shape. There is a step on the valve body near the top of the valve body. There is a shoulder 9 matched with the step, and a packing cover is arranged in the valve body above the shoulder and close to the top of the valve body, and several packing rings 10 are arranged in the packing cover, and the packing rings are wedge-shaped, several wedge-shaped The packing rings cooperate with each other, the end of the lower valve stem close to the valve seat is provided with a spherical surface, the valve seat is provided with a self-lubricating adjusting pad 11 in contact with the spherical surface of the lower valve stem, and the surface of the self-lubricating adjusting pad facing the spherical surface of the valve stem is provided with a There is a composite coating, and the valve body is provided with a second sealing ring 12 near the upper valve stem and the lower valve stem.

The difference between embodiment 2 and embodiment 1 is that: the valve seat is connected to the valve body through a spring.

In the utility model, the valve seat can move as a piston in the valve body, specifically, it can be realized by connecting the valve seat and the valve body through a spring (the elastic coefficient of the spring should not be too large). The contact between the valve core and the valve seat forms an included angle of 90° with respect to the surface of the valve seat. When the valve core is turned on or off, it can directly cut off the fouling on the surface of the valve core.

In order to facilitate the replacement and maintenance of the valve seat and prevent the valve seat from blowing out under reverse pressure, a replaceable retaining ring is designed in front of the valve seat, and the retaining ring can be fixed to the valve body by screws, which facilitates the replacement of the retaining ring and the valve seat And maintenance and prevent the valve seat from blowing out when reverse pressure is applied. The side of the retaining ring facing the surface of the valve core is provided with several recesses so that the surface is in a zigzag shape. This design increases the flow area and is also more convenient to manufacture the retaining ring, and the manufactured retaining ring is not easy to break.

In order to better reduce friction, the spherical surface on the lower valve stem is designed to form a point contact with the self-lubricating adjustment pad, and the contact surface is smaller, so the friction is smaller. The composite coating on the self-lubricating adjustment pad is preferably made of 304 stainless steel and polytetrafluoroethylene.

The valve seat is provided with a concave part on the side close to the valve body (or the tail of the valve seat is provided with a waterline), and the valve seat is in contact with the valve body near the concave part, and a first seal is provided between the valve seat and the valve body. This design reduces the pressure of the axial sealing pen and forms a double seal with the first sealing ring, making it easier for the valve seat to block the medium.

Due to the gap between the upper and lower bearings and the upper and lower valve stems, if there is a granular medium in the fluid during use, it will easily cause the valve stem to be stuck and cannot meet the opening and closing requirements. Therefore, a second sealing ring is installed at the upper and lower valve stems of the valve body to facilitate Dustproof, while the second seal ring also plays the role of the first seal. Both the first sealing ring and the second sealing ring are preferably O-rings.

Ordinary valve design only considers the anti-flying of the pin, and omits that when the valve stem embedded in the valve core breaks, it cannot be anti-flying. Therefore, a shoulder is set on the upper valve stem to cooperate with the packing cap to ensure the safety of the valve.

There are several packing rings in the stuffing cover, and several packing rings cooperate with each other. The packing rings are preferably wedge-shaped. The packing rings can be divided into the first packing ring and the second packing ring. There are several packing rings. The longitudinal section of the second packing ring is an isosceles trapezoid or an isosceles triangle. The angle formed by the two waists or the extension line of the two waists is preferably 45°. The first packing ring is located at Both ends of the inner axis of the packing cap, and on the premise that the longitudinal section of the second packing ring is an isosceles trapezoid or an isosceles triangle, the first packing ring is a right-angled trapezoid or a right-angled triangle matching the shape of the second packing ring, and several second The packing ring is located between the two first packing rings and cooperates with each other.

Those skilled in the art should know that the protection scheme of the present invention is not limited to the above-mentioned embodiments, and various arrangements, combinations and transformations can be performed on the basis of the above-mentioned embodiments. For example, the sealing surface of the valve core is a spherical surface, and the back of the valve core There is an arc-shaped protrusion (bow-shaped protrusion), and there is a gap between the arc-shaped protrusion and the back of the valve core to allow the fluid to pass through and reduce the flow resistance. ribs. On the premise of not violating the spirit of the utility model, various changes made to the utility model all fall within the protection scope of the utility model.

Claims (2)

1. Piston-type double-scraper two-way hard-sealed rotary ball valve, including valve body, valve seat, upper valve stem, lower valve stem and valve core, characterized in that the contact between the valve core and the valve seat forms a 90° angle relative to the surface of the valve seat The angle between the valve seat and the valve body is provided with a first sealing ring, the valve seat is provided with a concave part on the side close to the valve body, and the valve seat is detachably fixedly connected to the sealing surface of the valve seat There is a baffle ring, the side of the baffle ring facing the surface of the valve core is provided with several recesses so that the surface is in a zigzag shape, a step is provided on the valve body near the top of the valve body, and a shoulder matching the step is provided on the upper valve stem , the valve body located above the shoulder and close to the top of the valve body is provided with a packing cover, and several packing rings are provided in the packing cover, a spherical surface is provided at the end of the lower valve stem near the valve seat, and a spherical surface is provided on the valve seat. There is a self-lubricating adjusting pad in contact with the spherical surface of the lower valve stem, and a composite coating is provided on the surface of the self-lubricating adjusting pad facing the spherical surface of the valve stem. The second sealing ring matched with the lower valve stem. 2. The piston-type double-scraper two-way hard-sealed rotary ball valve according to claim 1, characterized in that the valve seat and the valve body are connected by a spring.