CN2795577Y - Gate valve - Google Patents

Abstract

The utility model relates to a gate valve which comprises a valve body, a gate plate, a valve rod, a valve cap, a handwheel assembly, etc., wherein the connection position of the valve rod and the valve cap is sealed by a two-channel O-shaped ring, and the axial positioning is carried out through two shaft shoulders of the valve rod and the valve cap. The handwheel is rotated to drive the valve rod to rotate, thereby, the gate plate makes upward and downward movement. The condition that the valve is opened and closed is realized. The utility model has the advantages of simple structure, opening labor saving, convenient assembly and disassembly, etc.

Description

Gate valve

Technical field

The utility model relates to a kind of pipeline and opens and closes element, especially gate valve.

Background technique

Gate valve is a kind of the most frequently used keying valve, its open-shut device (flashboard) is done elevating movement in the plane perpendicular to the gate channel center line, block or connect medium in the pipeline as gate, it is widely used in the liquid transmission line system, especially is applied to the keying of plumbing transmission pipeline.It is little that gate valve has fluid resistance, and structure length is short, the unrestricted advantage of media flow direction.But its shortcoming also is significantly, and big as opening and closing moment, the valve stem seal place easily abrades, and part is many, complex structure, and material is many, and the cost height is made and keeps in repair comparatively shortcomings such as difficulty.At present a large amount of research and improvement have been done at aspects such as Gate-valve sealing structure, sealing materials both at home and abroad, the axially locating that adopts filler and trim ring, valve rod as the sealing between valve rod and the valve gap is fixing etc. by collar, though reducing scratch on the sealing surface, prolonging gate valve working life etc. and obtain some progress on the problem, but its sealing also is not very desirable, and the more important thing is as the collar of axially locating and bring very big inconvenience for the dismounting of this valve.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the defective of prior art and provides a kind of and opens and closes that moment is little, valve stem seal is good, the gate valve of easy accessibility.

Technical problem of the present utility model is achieved through the following technical solutions:

A kind of gate valve, it comprises valve body, valve rod in the valve body connects the flashboard that opens and closes valve port, gland nut is connected on the valve body by valve gap, valve stem tip connects the handwheel assembly, the junction point that it is characterized in that described valve rod and valve gap is provided with the sealing of two pass " O " type circle, and makes axially locating by both shaft shoulders.

Compared with prior art, the seal element of the utility model valve rod and valve gap has adopted two pass " O " type circle, axially locating by self shaft shoulder realization, so simple in structure, valve stem seal improves, keying moment is reduced, and thoroughly changed the greatest drawback of dismounting inconvenience.

Description of drawings

Fig. 1 is a sectional structure schematic representation of the present utility model.

Embodiment

To elaborate again to the utility model embodiment by above-mentioned accompanying drawing below.

As shown in Figure 1, gate valve is made of valve body 1, flashboard 2, valve rod 3, valve gap 4, handwheel assembly etc., valve body 1 and valve gap 4 are threaded, valve rod 3 in the valve body is threaded with the flashboard 2 that opens and closes the valve body valve port, and compress with being threaded of valve gap 4 by gland nut 6, the sealing of valve rod and valve gap realizes by two pass " O " the type circle 5 that is installed in the valve rod annular groove, its axially locating reaches by the two self the shaft shoulder, specifically reaches by the shaft shoulder of valve rod and the interior omoplate and the compressing of gland nut of valve gap.The overhanging top of valve rod 3 connects the handwheel assembly of being made up of handwheel 7, label 8, nut 9.

Claims (1)

1, a kind of gate valve, it comprises valve body (1), valve rod (3) in the valve body connects the flashboard (2) that opens and closes valve port, gland nut (6) is connected on the valve body by valve gap (4), valve stem tip connects the handwheel assembly, it is characterized in that the described valve rod (3) and the junction point of valve gap (4) are provided with two pass " O " type circle (5) sealing, and make axially locating by both shaft shoulders.

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