CN-117984266-B - LNG axial-flow type check valve disk seat mounting tool

CN117984266BCN 117984266 BCN117984266 BCN 117984266BCN-117984266-B

Abstract

The invention relates to an LNG axial flow type check valve seat mounting tool which is used for mounting internals such as an LNG axial flow type check valve seat, a four-open ring and a lip-shaped sealing ring. The valve seat compression bolt comprises a positioning lining ring, a supporting flange, a fixing bolt, a fixing beam, a valve clack compression bolt, a positioning plug, a valve seat compression bolt, a fixing stud and a fixing nut. The mounting tool is used for fixing the whole mounting tool on a valve through a fixing stud and a fixing nut, fixing a fixing beam and a supporting flange through a fixing bolt, simultaneously compacting a valve seat and a valve clack through adjusting a valve seat compacting bolt, independently compacting the valve clack through adjusting the positions of the valve clack compacting bolt and a positioning plug after compacting, and lifting a positioning lining ring through loosening the valve seat compacting bolt after the valve clack is fixed, so that the problem of four-open-loop mounting is solved, and mounting of internal parts such as a valve seat of an LNG axial flow check valve is completed.

Inventors

CHEN ZHUANHAO
ZHANG BAOLOU
MA YUNHUI
XU BINGQUAN
REN LIJIE

Assignees

中核苏阀科技实业股份有限公司

Dates

Publication Date: 20260512
Application Date: 20221104

Claims (1)

1. The LNG axial flow check valve seat mounting tool is characterized by comprising a positioning lining ring, a support flange, a valve seat compression bolt, a valve clack compression bolt, a fixed beam and a positioning plug, wherein the positioning lining ring and the support flange are arranged up and down, the positioning lining ring and the support flange are connected through the valve seat compression bolt, the fixed beam is arranged on the support flange, and the bottommost end of the valve clack compression bolt corresponds to the positioning plug; One side of the support flange is provided with a positioning shoulder matched with the channel hole in the valve body to realize positioning of the support flange; the inner ring is provided with screw holes for fixing the fixed beam and installing the valve seat compression bolt; The upper end of the valve clack compression bolt takes the fixed beam as a support, and the lower end provides feeding force for the positioning plug to provide axial force for compressing the valve clack; The upper end of the valve seat compression bolt takes the support flange as a support, four valve seat compression bolts are symmetrically wrenched, the valve seat is pressed into the valve seat stably by axial feeding force of the positioning lining ring, and after the valve seat is in place, the positioning lining ring is lifted to be separated from the valve seat by screwing out the valve seat compression bolt, so that a space is reserved for installing four open rings; the two ends of the fixed beam are connected with the support flange through the fixed bolts, so as to provide support for the valve clack compression bolts; The upper end of the positioning plug is matched with the valve clack compression bolt and used for transmitting axial force, the lower end of the positioning plug is provided with an arc surface and matched with the valve clack and used for dispersing the axial force, so that the pressure concentration of the valve clack is reduced and the valve clack is protected from being damaged.

Description

LNG axial-flow type check valve disk seat mounting tool Technical Field The invention relates to an LNG axial flow type check valve seat mounting tool, belongs to the field of valves, and is applied to mounting of LNG axial flow type check valve seats. Technical Field When the large-caliber LNG axial flow check valve is assembled, the valve clack and the cylindrical spiral spring are required to be installed in place, then the lip-shaped sealing ring and the valve seat are installed, and the four-ring opening and the fastening piece are installed, so that the installation and the fixation of the valve seat are completed. During actual installation, the height of the spring is far greater than that of the spring in a compressed state, so that the valve seat is separated from the installation position, and further the four-opening ring for fixing the valve seat cannot be installed, and finally the final assembly of the valve cannot be completed. Disclosure of Invention The invention provides the LNG axial flow type check valve seat mounting tool, which solves the problem of mounting the LNG axial flow type check valve seat effectively. In order to solve the problems, the technical scheme adopted by the invention is that the LNG axial flow type check valve seat mounting tool. The valve seat compression bolt comprises a positioning lining ring, a supporting flange, a valve seat compression bolt, a valve clack compression bolt, a fixing beam and a positioning plug, wherein the positioning lining ring and the supporting flange are respectively arranged at the upper end and the lower end of a valve body, the positioning lining ring and the supporting flange are connected through the valve seat compression bolt, the fixing beam is arranged on the supporting flange, the fixing beam and the supporting flange are fixed through the valve clack compression bolt, and the bottommost end of the valve clack compression bolt corresponds to the positioning plug. The positioning lining ring is an annular part, the outer circle of the positioning lining ring is in positioning fit with the inner hole of the valve body, the inner hole of the valve body is used as a moving guide of the positioning lining ring, four groups of step holes are formed in the end face of the positioning lining ring, lifting screws penetrate through the step holes and are connected with the valve seat compression bolts, and axial movement of the positioning lining ring is achieved along with tightening or loosening of the valve seat compression bolts. The support flange is an annular part, the outer ring of the flange is provided with a through hole, the fixing stud and the fixing nut are connected with the valve body through the through hole, the inner ring of the flange is provided with screw holes, the fixing bolt is used for connecting the fixing beam with the support flange through two screw holes, and the rest screw holes are used for installing the valve seat compression bolt. The fixing beam is a long rod-shaped part, through holes are formed in two ends of the fixing beam, fixing bolts are installed in the through holes and connected with the support flange, a screw hole is formed in the center of the fixing beam and matched with the valve clack pressing bolts for independently pressing the valve clack, and open spaces are formed in two sides of the fixing beam and the support flange after the fixing beam and the support flange are combined and used as passages for parts to enter and exit. The valve clack compression bolt is connected with the fixed beam through threads and independently provides axial downward pressure for the valve clack, and is matched with the positioning plug at the end part, so that the contact area with the valve clack is enlarged, and the top spherical surface of the valve clack is prevented from being damaged. The valve seat compression bolt is connected with the support flange through threads to provide axial downward pressure for the valve seat, and the top is provided with threads and matched with the lifting screw to realize axial movement of the positioning lining ring, a flat gasket is arranged between the threads and the lifting screw, so that the stress area is increased to prevent the positioning lining ring from being damaged due to concentrated stress. The LNG axial flow type check valve seat mounting tool has the beneficial effects that the problem that the LNG axial flow type check valve seat and other internal parts cannot be mounted in place due to the influence of the cylindrical spiral spring is well solved by the tool, and the LNG axial flow type check valve seat mounting tool is reasonable in design, simple in structure and convenient to operate. Drawings FIG. 1 is a schematic diagram of an LNG axial flow check valve seat installation tool according to the present invention; FIG. 2 is a top view of FIG. 1; FIG. 3 is an enlarged view of a portion of FIG. 1; FIG. 4 is a schematic diagram of the free sta