Expansion pipe sealing valve and design and manufacturing method thereof

Abstract

The invention belongs to the field of valves. The invention discloses an expansion pipe sealing valve and a design and manufacturing method thereof. According to the expansion pipe sealing valve, a traditional design structure is changed such that an expansion pipe valve seat is installed in a valve body; the interior of the expansion pipe valve seat does not take part in conduction of media, butthe inner wall of the valve body is extruded through expansion deformation of the expansion pipe valve seat, so that the medium circulation space is cut off; the expansion pipe sealing valve is characterized in that an included angle exists between the inner diameter center line of the expansion pipe valve seat and the fed medium center line of a medium inlet pipe as well as the discharged mediumcenter line of a medium outlet pipe, rather than coincidence like center lines of a butterfly valve and a ball valve; the diameter of the expansion pipe valve seat is smaller than the inner diameter of the valve body, and the expansion pipe valve seat is inflated or filled with liquid for expansion through the valve depending on an automatic power source; the expanded expansion pipe valve seat isfit with the valve body closely for blocking the medium circulation space in the valve body, so that the sealing of the valve is achieved; through control of the automatic power source, the cutoff andconduction of the media through the valve are achieved; and the valve body is small in size, and the cost is low. In addition, the invention further provides a design and manufacturing method for theexpansion pipe sealing valve.

Description

technical field [0001] The proposal relates to the field of valves, and specifically relates to a new type of valve that relies on the expansion of the valve seat of the expansion pipe to contact the valve body to close the medium delivery section to realize the cutting and conducting of the medium, and its design and manufacturing method. Background technique [0002] In the prior art, the centerline butterfly valve, floating ball valve, and pinch valve are generally sealed in the following form. The centerline butterfly valve is in the frictional contact between the valve plate and the valve seat, and the valve plate compresses the valve seat to deform, closing the medium flow section, and realizing seal. [0003] The floating ball valve is a frictional contact between the floating valve ball and the valve seat, and the floating valve ball and the valve seat are pressed to close the medium flow section and form a seal. [0004] The pinch valve is a valve in which the rubb...

AI Technical Summary

Problems solved by technology

[0007] 1. Butterfly valve and ball valve, because the valve plate of the butterfly valve is in direct contact with the valve seat, and the ball of the ball valve is in direct contact with the pressure ring, the friction between the valve seat and the valve plate or the friction between the valve ball and the pressure ring will cause the seat or pressure ring to Abrasion, shedding or large or small particles, polluting the conveyed medium

[0008] 2. The sealing surface of the butterfly valve is the contact part between the valve plate and the valve seat, and the sealing surface of the ball valve is the contact part between the valve ball and the pressure ring; when the particles in the conveying medium rub against the contact surface of the valve plate or valve ball, the valve plate or valve The ball contact edge sometimes produces scratches through the sealing surface, and the seal will fail at this time. In practical applications, the valve plate and valve ball are easy to wear and fail

[0009] 3. Pneumatic or hydraulic butterfly valves and ball valves need to be equipped with independent pneumatic actuators or hydraulic actuators, and the cost of the valves is high

[0010] 4. Because the medium of the butterfly valve and the pinch valve must flow through the valve seat, the centerline of the inner diameter of the valve seat coincides with the centerline of the medium circulation, which will inevitably cause the outer diameter of the valve seat to be larger than the diameter of the medium flow section, and the result is a sealed valve seat The actual diameter is larger than the nominal diameter of the valve (for example, the diameter of the valve seat of DN100 is greater than 100), because the valve body needs to accommodate the sealed valve seat, resulting in a large volume of the valve body; because the internal passage of the valve ball is a medium flow passage, the valve ball is large in volume. , the valve body must accommodate the valve ball, resulting in a large volume of the valve body; the above factors lead to a large consumption of valve body materials and high manufacturing costs

[0011] 5. On-line maintenance capability. Butterfly valves, ball valves and pinch valves generally do not have on-line maintenance capabilities due to the structural limitations of the internal valve ball, valve plate and valve seat. Seat capacity; when replacing damaged spare parts, the valve needs to be disassembled from the pipeline for maintenance, which takes a long time and requires high labor maintenance costs

[0012] 6. Butterfly valve and pinch valve, due to structural limitations, a valve can only enter one kind of material, and does not have the function of mixing materials

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