CN2434498Y - Single flange template non-return device - Google Patents

Abstract

The utility model discloses a single-flange different-diameter non-return device used for an inner pump outlet pipeline of an oil transfer pipeline, a water transfer pipeline, an oil refining device and a petrifaction device, which comprises a casing, a flange, a sealing flap and a sealing ring. A reset spring is arranged on a coupling rod of the sealing flap, the casing is formed by welding two different-diameter sections, the upper side of the casing only is provided with the flange at an outlet end of a medium, and an inlet and an outlet of the medium are different nominal diameters. The flange at an inlet end of the medium is welded after the annular directional position in mounting field, the sealing flap is a cone shape or a plane shape, and the non-return device is welded with the casing and has light weight and smooth inner cavity. The direct connection of the upper part and a gate valve is realized, the direct connection of the lower part and the flange at the outlet of the pump is realized, and the whole length can be adjusted according to the field need.

Description

Single flange different-diameter backstop

The utility model is to be used for the pump discharge pipeline, prevents what medium from flowing backwards, single flange different-diameter backstop,

The oil field oil transportation, aqueduct and oil refining, pump discharge pipeline in the petrochemical plant, according to the technological process requirement, safety check need be set, to prevent that medium from flowing backwards, this safety check requires to be installed between the gate valve on pump discharge and the main line, because pump discharge is different with the safety check nominal diameter, generally a reducer need be installed between pump discharge and safety check, such mounting structure was both loaded down with trivial details, cause pump discharge gate valve height very high again, give production operation, construction and installation and maintenance all bring difficulty, and a kind of pair of flange cast structure reducing check valve appearred in for a change this present situation at present, it is integrated non-return and reducer, valve body is a cast structure, and the valve body two ends have flange, ball face sealing structure, though having realized non-return and reducing is the function of one, but also have following problem: cast housing is limited by mould, and the valve body length change is dumb, particularly is difficult to be applicable to the scene for this valve of improvement project in the pump house; Because this valve is imported and exported flange and valve body is cast into one, and finish the location processing of bolt hole in manufactory, and at this safety check outlet(discharge) flange of erecting bed directly with after last gate valve connects, not coincideing appears in the sealing surface of suction flange and pump discharge flange facing form often; Bolt hole is difficult to or can't with pump discharge flange bolt hole circumferencial direction centering, present solution (1), between pump discharge and safety check adds a two flange short circuit, solves the inconsistent phenomenon of sealing surface, and realizes the circumferencial direction centering; (2), with angle of the top gate valve operation inclined to one side brick of handwheel, realize bolt hole circumferencial direction centering, these two kinds of ways have been brought new problem, as have increased the height of two flange short circuit straight lengths, have wasted a pair of flange, have increased the static seal leakage point; Top gate valve handwheel is in the way of an angle of circumference upper deflecting, and is very lack of standardization in appearance, and main is that for the heavy caliber gate valve, handwheel takes up space very big, on-the-spot very difficult the realization.

The purpose of this utility model is, for overcoming the deficiency of prior art, provides a kind of welded structure housing, and shell dimension can change in a big way, and the housing body is light, and good sealing effect can directly be connected the single flange different-diameter backstop between pump discharge and the gate valve.

Following mode can realize the utility model:

Single flange different-diameter backstop, comprise housing, flange, sealing lobe, seal ring, on the coupling rod of sealing lobe, Returnning spring be housed, described housing is by two reducer welding fabrications, only be with the media outlet end flange on the housing, and the import and export of medium are different nominal diameters, medium entrance point flange is in the back welding of erecting bed hoop location, and the sealing lobe is taper or plane shape.

The media outlet end flange is with integrally welded with housing.

The utility model is the improvement on the basis of non-return and reducing, housing is a welded structure, inner chamber is smooth, no casting defect, good reliability, the shell length size can change in a big way flexibly according to customer requirements, himself outlet institute's single flange of being with is after erecting bed and top gate valve are linked in sequence, lower case can be directly and the welding of pump discharge companion flange centering, both guaranteed the centering in circumference orientation, shortened structure length again, realized that top directly was connected with gate valve, the bottom directly is connected with the pump discharge flange, need not set up any steel tubing in different shapes and short circuit straight length, adapt to the operation and maintenance needs for making top gate valve operation handwheel height, available lengthening or the method that shortens this non-return device length realize, internal seal structure can adopt dimension face or plane sealing according to customer requirements, guarantees sealed precision.

Fig. 1, plane sealing structure list flange different-diameter backstop schematic representation;

Fig. 2, the single flange different-diameter backstop of conical surface seal structure schematic representation.

Embodiment 1:

As shown in Figure 1, housing 1 is a welded structure, divide two-part die forming reducer up and down, middle only one butt weld, two-part weldering is one, the medium of housing 1 is imported and exported and is different nominal diameters, housing on welding medium outlet end flange 8, packing holder 6 and housing 1 lower inner wall annular solder sealing and fixing, sealing lobe 4 is a plane sealing structure with seal ring 5, housing 1 inner chamber is fixed a streamline resting type spring support 2, Returnning spring 3 is housed, the companion flange of medium entrance point and pump discharge on the extension bar between sealing lobe 4 and the resting type spring support 2, in the back welding of erecting bed hoop location, the media outlet end directly is connected with flange with gate valve on the process pipe, and the length dimension of housing can be adjusted flexibly, and 7 is guide bushs among the figure.

Embodiment 2:

As shown in Figure 2, whole non-return device structure is substantially the same manner as Example 1, and difference only is that seal ring 9 and sealing lobe 10 are dimension shape sealing configuration.

Claims (2)

1, a kind of single flange different-diameter backstop, comprise housing, flange, sealing lobe, seal ring, on the coupling rod of sealing lobe, Returnning spring be housed, it is characterized in that: described housing is two reducer welding fabrications, only be with the media outlet end flange on the housing, and the import and export of medium are different nominal diameters, medium entrance point flange is being installed existing this hoop location back welding, and the sealing lobe is taper or plane shape.

2, non-return device according to claim 1 is characterized in that: media outlet end flange and housing are integrally welded.

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