LNG axial check valve seat installation tool

Abstract

The application discloses a LNG axial flow check valve seat installation tool which is used for installing LNG axial flow check valve seat, four open rings and lip sealing rings and the like. The tool comprises a positioning bush ring, a supporting flange, a fixing bolt, a fixing beam, a valve clack pressing bolt, a positioning plug, a valve seat pressing bolt, a fixing stud and a fixing nut. The tool is fixed on the valve through the fixing stud and the fixing nut, the fixing beam is fixed with the supporting flange through the fixing bolt, the valve seat and the valve clack are simultaneously pressed through the valve seat pressing bolt, the valve clack is individually pressed through the valve clack pressing bolt and the positioning plug after being pressed, the four open rings are installed by loosening the valve seat pressing bolt and lifting the positioning bush ring after the valve clack is fixed, and the installation of the LNG axial flow check valve seat and the like is completed.

Description

Technical Field

[0001] This invention relates to an installation tool for an LNG axial flow check valve seat, belonging to the field of valves, and is applied to the installation of LNG axial flow check valve seats. Technical Background

[0002] When assembling a large-diameter LNG axial flow check valve, the valve disc and cylindrical helical spring must be installed first, followed by the lip seal and valve seat, and then the four-ring and fasteners to complete the installation and fixation of the valve seat. However, during actual installation, the spring's height in its natural state is much greater than in its compressed state, causing the valve seat to detach from its installation position. This prevents the four-ring fixing the valve seat from being installed, ultimately making it impossible to complete the valve assembly. Summary of the Invention

[0003] To address the above problems, this invention provides an LNG axial flow check valve seat installation tool, which effectively solves the problem of LNG axial flow check valve seat installation.

[0004] To solve the above problems, the technical solution adopted by the present invention is: an LNG axial flow check valve seat installation tool. It includes a positioning bushing, a support flange, a valve seat clamping bolt, a valve disc clamping bolt, a fixing beam, and a positioning plug; wherein the positioning bushing and the support flange are respectively disposed at the upper and lower ends of the valve body, and are connected by the valve seat clamping bolt; a fixing beam is disposed on the support flange, and the fixing beam and the support flange are fixed by the valve disc clamping bolt, with the lowermost end of the valve disc clamping bolt corresponding to the positioning plug.

[0005] The positioning ring is a ring-shaped part. The outer circle of the positioning ring forms a positioning fit with the inner hole of the valve body, and the inner hole of the valve body serves as a guide for the movement of the positioning ring. The end face of the positioning ring is provided with four sets of stepped holes. The lifting screw passes through the stepped holes and is connected to the valve seat clamping bolt. As the valve seat clamping bolt is tightened or loosened, the axial movement of the positioning ring is realized.

[0006] The supporting flange is a ring-shaped part. The outer ring of the flange has a through hole, through which the fixing stud and fixing nut are connected to the valve body. The inner ring of the flange has screw holes, through which the fixing bolt connects the fixing beam to the supporting flange, and the remaining screw holes are used to install the valve seat clamping bolt.

[0007] The fixed beam is a long rod-shaped part with through holes at both ends. Fixed bolts are installed in the through holes to connect with the support flange. A screw hole is provided in the center, which cooperates with the valve disc clamping bolt for individually clamping the valve disc. After the fixed beam and the support flange are combined, there are open spaces on both sides as passages for parts to enter and exit.

[0008] The valve disc clamping bolt is connected to the fixed beam by threads, providing axial downward pressure to the valve disc independently; a positioning plug is fitted at the end to increase the contact area with the valve disc and prevent damage to the top spherical surface of the valve disc.

[0009] The valve seat clamping bolt is connected to the support flange by threads to provide axial downward pressure to the valve seat; the top is threaded and cooperates with the lifting screw to realize the axial movement of the positioning bushing. A flat washer is placed between the two to increase the force-bearing area and prevent the positioning bushing from being damaged by force concentration.

[0010] The beneficial effects of this invention are as follows: An LNG axial flow check valve seat installation tool effectively solves the problem that the internal components of the LNG axial flow check valve seat cannot be installed properly due to the influence of the cylindrical helical spring. The tool is reasonably designed, has a simple structure, and is easy to operate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an LNG axial flow check valve seat installation tool according to the present invention;

[0012] Figure 2 for Figure 1 Top view;

[0013] Figure 3 for Figure 1 Enlarged view of a portion;

[0014] Figure 4 A schematic diagram of the free state of components of an LNG axial flow check valve;

[0015] Figure 5 This is a schematic diagram of the four-loop installation positions;

[0016] Explanation of reference numerals in the attached drawings: 11-Positioning bushing; 12-Support flange; 13-Fixing bolt; 14-Fixing beam; 15-Valve disc clamping bolt; 16-Positioning plug; 17-Valve seat clamping bolt; 18-Fixing stud; 19-Fixing nut; 31-Large washer; 32-Flat washer; 33-Lifting screw; 41-Valve body; 42-Valve seat; 43-Lip seal; 44-Valve disc; 45-Cylindrical helical spring; 51-Four-ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] This invention relates to a valve seat installation tool for an LNG axial flow check valve. For example... Figure 4 Before using the tool, first install the cylindrical helical spring, valve disc, lip seal, and valve seat into the valve body. The lip seal should be engaged with the guide bevel, ensuring a seamless fit between the lip seal and the valve body. For example... Figure 1Assemble the support flange, valve seat clamping bolts, large washer, flat washer, lifting screw, and locating bushing together. During installation, insert the assembled tool through the inner channel and secure it to the valve body using the support flange, fixing studs, and fixing nuts. Screw in the valve seat clamping bolts to ensure the locating bushing fits snugly against the valve seat. Then proceed as follows... Figure 2 Connect the fixed beam to the support flange using fixing bolts, and then... Figure 1 As shown, screw in the valve disc clamping bolts and locating plugs to tighten the valve disc, ensuring it remains completely detached from the valve seat. Symmetrically tighten the four valve seat clamping bolts, applying axial force to the valve seat through the locating bushings to smoothly press it in. Continue tightening until the outer circumference of the valve seat locating bolts aligns with the valve body locating step, as shown. Figure 1 As shown, the valve seat has reached its final position. After the valve seat is in place, unscrew the valve seat clamping bolt and lift the positioning bushing to separate it from the valve seat, making room for the installation of the four-open ring. Figure 5 As shown, the installation is complete once the four open rings are in place.

Claims

1. A valve seat installation tool for an LNG axial flow check valve, characterized in that: It includes a positioning bushing, a support flange, a valve seat clamping bolt, a valve disc clamping bolt, a fixing beam, and a positioning plug; wherein the positioning bushing and the support flange are arranged vertically, and the positioning bushing and the support flange are connected by the valve seat clamping bolt. A fixing beam is set on the support flange, and the lowest end of the valve disc clamping bolt corresponds to the positioning plug. The supporting flange has a positioning shoulder on one side that mates with the channel hole inside the valve body to position the supporting flange; the outer ring has a through hole that, when used with a fixing stud and a fixing nut, fixes the supporting flange to the valve body; the inner ring has a screw hole for fixing the fixing beam and installing the valve seat clamping bolts. The upper end of the valve disc clamping bolt is supported by a fixed beam, and the lower end provides axial force for clamping the valve disc by providing a feeding force to the positioning plug. The upper end of the valve seat clamping bolt is supported by the support flange. The four valve seat clamping bolts are symmetrically tightened. The valve seat is given axial feed force through the positioning bushing and pressed into the valve seat smoothly. After the valve seat is in place, the valve seat clamping bolt is unscrewed and the positioning bushing is raised to separate it from the valve seat, making room for the installation of the four open rings. The two ends of the fixed beam are connected to the support flange by fixed bolts, providing support for the valve disc clamping bolts; The upper end of the positioning plug is engaged with the valve disc clamping bolt to transmit axial force, and the lower end is provided with an arc surface to engage with the valve disc to disperse axial force, reduce pressure concentration on the valve disc, and protect the valve disc from damage.

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