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CN-121993636-A - Locking check valve

CN121993636ACN 121993636 ACN121993636 ACN 121993636ACN-121993636-A

Abstract

The invention belongs to the technical field of valves, and discloses a locking check valve which comprises a valve body assembly, a valve clack, an elastic piece, a limiting rod, a first locking piece and a second locking piece, wherein the limiting rod, the first locking piece and the second locking piece can form a locking structure of the locking check valve, the valve clack can be gradually switched from a blocking position to a full-open position under the action of medium pressure, and when the valve clack reaches the full-open position, the first locking piece is switched to the locking position and matched with the second locking piece to mechanically lock the limiting rod and the valve clack to the full-open position. At this time, the valve clack does not need to overcome the spring force and self gravity to maintain to open by means of medium pressure, so that dynamic obstruction of the valve clack to the medium can be eliminated, pressure loss is reduced, additional power consumption of the pump can be effectively reduced for a large-flow system, energy loss in long-term operation is reduced, equipment operation cost is reduced, and energy efficiency of the system is improved.

Inventors

  • YU JUNYANG
  • CHENG JINFU
  • LI CHEN
  • YANG TIANQING

Assignees

  • 纽威石油设备（苏州）有限公司

Dates

Publication Date
20260508
Application Date
20260330

Claims (10)

  1. 1. The utility model provides a locking-type check valve, includes valve body subassembly (1), valve clack (2) and elastic component (3), valve clack (2) set up in the inside of valve body subassembly (1), elastic component (3) set up in between valve body subassembly (1) with valve clack (2), so that valve clack (2) can be along the axial lift, thereby make it switch between shutoff position and full open position, its characterized in that, locking-type check valve still includes: the limiting rod (4) penetrates through the valve body assembly (1) along the axial direction, and one end of the limiting rod is fixedly connected with the valve clack (2); The first locking piece (5) is movably arranged outside the valve body assembly (1) so as to enable the valve body assembly to be switched between a locking position and an unlocking position; The second locking piece (6) is arranged on the limiting rod (4), and when the second locking piece (6) moves to a position opposite to the first locking piece (5), the valve clack (2) is in the full-open position; Wherein, when the first locking piece (5) is at the locking position, the first locking piece and the second locking piece (6) can be matched to form locking of the limit rod (4); when the first locking piece (5) is in the unlocking position, the second locking piece (6) is separated from the first locking piece (5) so as to allow the limiting rod (4) to lift along the axial direction.
  2. 2. The locking check valve according to claim 1, characterized in that the second locking element (6) is an annular groove provided on the stop lever (4); The first locking piece (5) is a baffle plate which is in fit and clamping connection with the annular groove.
  3. 3. The locking check valve according to claim 2, characterized in that one end of the flap is rotatably arranged in the valve body assembly (1) and the other end can be fixed with the valve body assembly (1) by means of a locking element (7) when it is in the locking position.
  4. 4. The locking check valve according to claim 1, wherein a clamping portion (41) is arranged at the end portion of the limiting rod (4), and a clamping groove which is matched with the clamping portion (41) in a profiling mode is arranged on the valve clack (2).
  5. 5. The locking check valve according to claim 1, wherein the valve body assembly (1) comprises a valve body (11), a valve cover (12) and a guide sleeve (13), an opening is arranged on the valve body (11), the valve cover (12) covers the opening, and the guide sleeve (13) is fixed at the bottom of the valve cover (12); the limiting rod (4) is provided with a limiting part (42), and the limiting part (42) and the valve clack (2) are both in sliding connection with the inner side wall of the guide sleeve (13).
  6. 6. The locking check valve according to claim 5, characterized in that a mounting groove (121) contoured to the limit portion (42) is provided at the bottom of the valve cover (12), and that a portion of the limit portion (42) can be inserted into and fitted with the mounting groove (121) when the valve flap (2) is in the fully open position.
  7. 7. The locking check valve according to claim 5, characterized in that the limit part (42) is attached to the end of the valve flap (2).
  8. 8. The locking check valve according to claim 5, characterized in that the guide sleeve (13), the valve cover (12), the limit part (42) and the limit rod (4) can enclose a chamber; A first air passage (43) is formed in the limiting rod (4), and one end of the first air passage (43) is communicated with the cavity; The valve clack (2) is provided with a second air passage (21), one end of the second air passage (21) is communicated with the first air passage (43), and the other end of the second air passage is communicated with the interior of the valve body (11).
  9. 9. The locking check valve according to claim 1, characterized in that a dynamic sealing structure (8) is provided between the stop lever (4) and the valve body assembly (1).
  10. 10. The locking check valve according to claim 1, wherein the valve body assembly (1) comprises a first flow passage (14), a second flow passage (15) and a third flow passage (16) in sequential communication, the second flow passage (15) extending in the axial direction; a valve seat (17) which is matched with the valve clack (2) in a profiling mode is arranged in the second flow passage (15).

Description

Locking check valve Technical Field The invention relates to the technical field of valves, in particular to a locking check valve. Background The lifting check valve is a key device for preventing medium in a pipeline from flowing backwards, and is widely applied to pump outlet pipelines in the industries of electric power, petrochemical industry, water service and the like. The current lifting check valve comprises a valve body component, a valve clack and a spring, wherein the valve clack is arranged in the valve body component, and the spring is arranged between the valve body component and the valve clack, so that the valve clack can lift along the axial direction, and is switched between a blocking position and a full-open position. When the medium flows forward, the valve clack is pushed up by the pressure of the medium, so that the check valve is in a conducting state, and when the medium flows back, the valve clack can be tightly abutted against the valve seat under the action of the spring, the dead weight of the valve clack and the return pressure, so that the check valve is in a closing state. However, when the lifting check valve is in a fully opened state, that is, when the valve clack is in a fully opened position, the valve clack still needs to overcome the spring force and self gravity by means of medium pressure to maintain the opening position. At this time, the valve clack is suspended in the center of the flow channel all the time, and becomes a dynamic obstacle in medium flow, unnecessary pressure loss is easy to generate, and for a large-flow system, the accumulated energy consumption of the additional flow resistance is considerable, so that the power consumption and the running cost of the pump are increased. Therefore, the above-described problems are to be solved. Disclosure of Invention The invention aims to provide a locking check valve, which is used for avoiding unnecessary pressure loss of a medium when a valve clack is in a full-open state and reducing power consumption and running cost of a pump. To achieve the purpose, the invention adopts the following technical scheme: The locking check valve comprises a valve body assembly, a valve clack and an elastic piece, wherein the valve clack is arranged in the valve body assembly, the elastic piece is arranged between the valve body assembly and the valve clack, so that the valve clack can axially lift and fall, and is switched between a blocking position and a full-open position, The locking check valve further includes: The limiting rod penetrates through the valve body assembly along the axial direction, and one end of the limiting rod is fixedly connected with the valve clack; The first locking piece is movably arranged outside the valve body assembly so as to enable the valve body assembly to be switched between a locking position and an unlocking position; the second locking piece is arranged on the limiting rod, and when the second locking piece moves to a position opposite to the first locking piece, the valve clack is in the full-open position; When the first locking piece is positioned at the locking position, the first locking piece can be matched with the second locking piece to form locking of the limiting rod; When the first locking piece is in the unlocking position, the second locking piece is separated from the first locking piece so as to allow the limiting rod to lift along the axial direction. Preferably, the second locking piece is an annular groove arranged on the limiting rod; the first locking piece is a baffle plate which is in fit and clamping connection with the annular groove. Preferably, one end of the baffle is rotatably arranged on the valve body assembly, and the other end of the baffle can be fixed with the valve body assembly through a locking piece when the baffle is in the locking position. Preferably, the end part of the limiting rod is provided with a clamping part, and the valve clack is provided with a clamping groove which is matched with the clamping part in a profiling way. Preferably, the valve body assembly comprises a valve body, a valve cover and a guide sleeve, wherein an opening is formed in the valve body, the valve cover is arranged on the opening in a covering mode, and the guide sleeve is fixed at the bottom of the valve cover; the limiting rod is provided with a limiting part, and the limiting part and the valve clack are both in sliding connection with the inner side wall of the guide sleeve. Preferably, a mounting groove contoured with the limiting portion is formed in the bottom of the valve cover, and when the valve clack is in the fully opened position, a portion of the limiting portion can be inserted into the mounting groove and attached to the mounting groove. Preferably, the limit portion is attached to an end portion of the valve flap. Preferably, the guide sleeve, the valve cover, the limiting part and the limiting rod can form a cavity; a first air passage is form