CN201661763U

CN201661763U - Gate valve

Info

Publication number: CN201661763U
Application number: CN201020128904XU
Authority: CN
Inventors: 叶建山; 张寿根; 方文亮
Original assignee: ZHEJIANG GUTE PNEUMATIC MACHINERY CO Ltd
Current assignee: Zhejiang Gute Pneumatic Technology Co., Ltd.
Priority date: 2010-03-11
Filing date: 2010-03-11
Publication date: 2010-12-01
Anticipated expiration: 2020-03-11

Abstract

The utility model relates to a gate valve comprising an air cylinder, a valve body, a valve rod and a gate plate, wherein one end of the valve rod extends into a valve cavity by a hole of the valve rod and is connected with the gate plate; and a stuffing box is arranged on the hole wall of the hole of the valve rod, a stuffing is arranged in the stuffing box and is sleeved on a rod body of the valve rod, and the outer end face of the stuffing is abutted with a gland. The gate valve is characterized in that a compression spring is sleeved on the rod body of the valve rod, one end of the compression spring is abutted with a front end cover of the air cylinder, and the other end of the compression spring is abutted with the gland. Compared with the prior art, the utility model changes the mode that a stuffing gland is pressed by a bolt and a nut into the mode that the stuffing gland is pressed by utilizing a compression spring. After the stuffing is abraded, the gland can automatically regulate the pretightening force to the stuffing under the action of the compression spring, so that the deformation of the stuffing is restored, and the sealing is ensured.

Description

A kind of gate valve

[technical field]

The utility model belongs to a kind of gate valve, relates in particular to a kind of valve rod leak-proof structure of gate valve.

[background technique]

At present, gate valve structure comprises valve body, and is arranged on the valve rod in the body cavity, and valve rod one end is connected with flashboard in valve rod hole stretches into valve pocket.For guaranteeing the sealing of valve rod hole, have stuffing box on the hole wall of valve rod hole, be equipped with fillers such as graphite, asbestos or rubber in the stuffing box, filler is set on the valve rod shaft, an exterior edge face and a gland offset, and again by fixedly compacting of bolt and nut, cause the filler distortion and the formation sealing.The problem that prior art exists is: because the pretightening force of gland is adjusted under the normal temperature normality in advance, in the real work, along with the increase of valve opening and closing number of times, filler can wear and tear gradually, and the gap is increasing, cause valve to be revealed, thereby need compress Gland again, not only inconvenience and maintenance workload are big, particularly the leakage of valve, gently then influence produce, working environment, heavy then cause the security incident that jeopardizes the person, jeopardizes production.

[summary of the invention]

For overcoming the problems referred to above that prior art exists, the utility model aims to provide a kind of gate valve, after this gate valve has the filler wearing and tearing, can adjust function automatically to the filler pretightening force, guarantee sealing, thereby reduce the valve maintenance workload significantly, even reach in proper functioning non-maintaining purpose in the cycle.

The technological scheme that realizes above-mentioned purpose is as follows: the gate valve of this structure, comprise cylinder, valve body, valve rod and flashboard, and valve rod one end is connected with flashboard in valve rod hole stretches into valve pocket; Have stuffing box on the hole wall of valve rod hole, be equipped with filler in the stuffing box, filler is set on the valve rod shaft, the exterior edge face of filler and a gland offset, it is characterized in that: on the shaft of valve rod, be with a pressure spring, one end of pressure spring pushes up mutually with the cylinder front cover, and the other end and the gland of pressure spring offset.

Beneficial effect: compared with prior art, change bolt and nut and compress Gland and compress Gland, after the filler wearing and tearing, under the effect of pressure spring for utilizing pressure spring, gland will be adjusted the pretightening force to filler automatically, make filler recover distortion and guarantee to seal.

[description of drawings]

Fig. 1 is the utility model embodiment broken section structural representation.

Among the figure: cylinder 1, valve rod 2, valve body 3, filler 4, gland 5, pressure spring 6, valve pocket 7.

[embodiment]

Referring to Fig. 1.This gate valve structure comprises cylinder 1, valve body 3, valve rod 2 and flashboard, and the lower end of valve rod 2 is connected with flashboard in valve rod hole stretches into valve pocket, and the upper end of valve rod 2 is passed valve rod hole and pushed up mutually with cylinder 1 front cover.Have stuffing box on the hole wall of valve rod hole, be equipped with filler 4 in the stuffing box, filler 4 is set on valve rod 2 shafts, the lower end surface of the exterior edge face of filler 4 and gland 5 offsets, pressure spring 6 is enclosed within on the shaft of valve rod 2, push up mutually with cylinder 1 front cover the upper end of pressure spring 6, and the lower end of pressure spring 6 and gland 5 offset.

Claims

1. a gate valve comprises cylinder (1), valve body (3), valve rod (2) and flashboard, and valve rod (2) one ends are connected with flashboard in valve rod hole stretches into valve pocket (7); Have stuffing box on the hole wall of valve rod hole, be equipped with filler (4) in the stuffing box, filler (4) is set on valve rod (2) shaft, the exterior edge face of filler (4) and a gland (5) offset, it is characterized in that: on the shaft of valve rod (2), be with a pressure spring (6), one end of pressure spring (6) pushes up mutually with cylinder (1) front cover, and the other end of pressure spring (6) and gland (5) offset.