CN201391659Y

CN201391659Y - Improved safety valve

Info

Publication number: CN201391659Y
Application number: CN200920067679U
Authority: CN
Inventors: 叶水来
Original assignee: Shanghai Far East High & Medium Pressure Valve Co Ltd
Current assignee: Shanghai Far East High & Medium Pressure Valve Co Ltd
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2010-01-27
Anticipated expiration: 2019-02-13

Abstract

The utility model relates to the technical field of safety valves, in particular to an improved safety valve used for a boiler, a container and a pipeline, comprising a valve body, a valve rod, a flange, a valve seat, a valve cover and a valve clack. The safety valve is characterized in that the matching position of the flange with the valve rod is provided with a back pressure regulating mechanism capable of automatically regulating back pressure along with the rising and dropping of the valve rod; the back pressure regulating mechanism is provided with a conical tube sleeve on the valve rod at the matching position of the flange with the valve rod; and the conical end of the conical tube sleeve is provided with a sealing ring. The improved safety valve has the advantages of total head and good return performances in structure, clear principle, simple structure, convenient regulation and head and return performances up to 100 percent; in addition, the improved safety valve has simple fabrication technology and low cost, and is worth popularizing and applying.

Description

A kind of modified model safety valve

[technical field]

The utility model relates to a kind of safety valve technical field, specifically a kind of modified model safety valve that is used on boiler, container, the pipeline.

[background technique]

Be used for the safety valve on high-temperature high-pressure boiler, container, the pipeline.It is to utilize spring force equilibrium valve import pressure medium not by external force, when equipment pressure surpasses setting value, and the valve opening discharging, the superpressure medium is reduced to specified value, valve closing, it is the protective gear that guarantees the normal operation of pressurized system.

At present, the major works key position still leans on import with the High Temperature High Pressure safety valve, various countries valve plant all adopts following structure, the gross data that does not also have quantitative calculation formula and debugging simultaneously abroad, strong enterprise all is the experience of debugging by full performance test device and operating mode separately, draws a well behaved safety valve.At first calculate the relevant size in larynx footpath of safety valve, select the geometric proportion size in flap, Disc holder, Adjusting ring and larynx footpath for use, and be suitable for the material and the heat treatment process of High Temperature High Pressure with spring by known discharge amount.Outside valve seat, designed Adjusting ring down, make at valve seat outer ring formation ejection ditch, flap obtains obviously anxious spray when opening, for will suddenly opening with high-lift obtaining simultaneously, ejection steam utilizes its reaction force downwards and to the peripheral direction emission surface, design has the rise pitch circle, encircle the emptying pressure (Reseating pressure of a safety valve) that up-down adjustment obtains setting thus, adopt rational manufacturing process, high-precision sealing surface grinding technique and exper ienced debugging, a qualified safety valve, must open full performance at safety valve full performance test device, discharging, the parameter of returning the seat performance will conform to the data of standard mutually by the data of microcomputer collection and the curve of printing, the back medium enters the flap back side by matching gap and the guide sleeve inner chamber forms back pressure as long as safety valve is opened, the safety valve outlet is in the pipeline of sealing, valve all has pressure to act on flap epicoele formation superimposed back pressure before open at the end, if can not getting rid of, back pressure acts on the flap back side, if spring rate is big, the lighter influences lift, weight person produces fearful chatter, usually get rid of whole back pressures at valve rod and middle flange slip place increasing matching gap, help lift, but do not have back pressure and return a poor performance, Japan type TFD flange place in valve body has increased modulating valve, regulates back pressure, and it is long-pending that magnitude of back pressure is adjusted to constant anchor ring by needle-like entirely, flap is opened up to total head, back pressure must be got rid of entirely, and anchor ring is long-pending just big, can't form back pressure, flap returns the no back pressure of seat, and time seat is unfavorable.

[summary of the invention]

The purpose of this utility model is exactly to solve above-mentioned deficiency, and a kind of modified model safety valve is provided.

Technological scheme provided by the utility model is: a kind of modified model safety valve, comprise valve body, valve rod, flange, valve seat, valve gap and flap, it is characterized in that: flange is provided with one with the valve rod place of matching and can rises with valve rod, descend and regulate the backpressure adjusting mechanism of back pressure automatically, described backpressure adjusting mechanism is the Taper Pipe cover that is provided with taper on the valve rod at flange and the valve rod place of matching, and is provided with a seal ring at Taper Pipe cover tapered end and constitutes.

When safety valve is opened, valve stem casing rises, and the anchor ring of taper is long-pending to be strengthened gradually, and back pressure is got rid of, help total head, when boiler pressure decline safety valve, safety valve was got back to total head at nearly 2/3 o'clock, and valve rod band Taper Pipe cover descends, the cambridge ring area narrows down to zero gradually, Taper Pipe cover on the valve rod stops back pressure to be got rid of with seal ring, and back pressure forms, and improves back the seat performance.

The utility model beneficial effect: structure plays total head fully and returns the well behaved effect of seat, and principle is distinct, and is simple in structure, easy to adjust, and the lift and time seat impact of performance can reach 100%; In addition, preparation process is simple, and cost is low, is worthy of popularization.

[description of drawings]

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

[embodiment]

Below in conjunction with the drawings and specific embodiments the utility model is described in detail:

As shown in Figure 1, a kind of modified model safety valve, comprise valve body, valve rod, flange, valve seat, valve gap and flap, flange is provided with one with the valve rod place of matching and can rises with valve rod, descend and regulate the backpressure adjusting mechanism 1 of back pressure automatically, backpressure adjusting mechanism 1 is to be provided with the Taper Pipe cover 3 that has taper on the valve rod at flange and valve rod 2 places of matching, and seal ring 4 cooperates to form with the tapered end of Taper Pipe cover 3 again and seals shape.

Claims

1, a kind of modified model safety valve, comprise valve body, valve rod, flange, valve seat, valve gap and flap, it is characterized in that: flange is provided with one with the valve rod place of matching and can rises with valve rod, descend and regulate the backpressure adjusting mechanism of back pressure automatically, described backpressure adjusting mechanism is to be provided with the Taper Pipe cover that has taper on the valve rod at flange and the valve rod place of matching, and is provided with a seal ring at Taper Pipe cover tapered end and constitutes.