US 12,455,581 B2
Gas negative pressure valve
Feng Zhang, Zhejiang (CN); Yunnan Wei, Zhejiang (CN); Jinghui Fan, Zhejiang (CN); and Hongbin Ren, Zhejiang (CN)
Assigned to NINGBO WANAN CO., LTD., Ningbo (CN)
Filed by NINGBO WANAN CO., LTD., Zhejiang (CN)
Filed on Oct. 31, 2023, as Appl. No. 18/498,998.
Claims priority of application No. 202321528295.0 (CN), filed on Jun. 15, 2023.
Prior Publication US 2024/0419196 A1, Dec. 19, 2024
Int. Cl. G05D 16/06 (2006.01); A62B 9/02 (2006.01); B63C 11/22 (2006.01); F16K 17/30 (2006.01)
CPC G05D 16/063 (2013.01) [F16K 17/30 (2013.01); A62B 9/025 (2013.01); B63C 11/2227 (2013.01); Y10S 137/908 (2013.01); Y10T 137/7836 (2015.04)] 11 Claims
OG exemplary drawing
 
1. A gas negative pressure valve, comprising a valve body (1) and a valve cover (2), wherein
a gas inlet and a gas outlet (3) are disposed on the valve body (1), and a gas inlet joint (4) is connected in the gas inlet;
a drive lever (5) is disposed inside the valve body (1), and a diaphragm assembly is disposed between the valve body (1) and the valve cover (2) and above the drive lever (5);
a first end of the drive lever (5) is connected to a lower end of the diaphragm assembly, and a second end of the drive lever (5) is connected with a sealing gasket (6) for blocking an inner end of the gas inlet joint;
the second end of the drive lever (5) is hinged on a sidewall of the valve body (1);
a reset spring (7) is disposed between the drive lever (5) and a bottom of an inner chamber of the valve body (1), wherein
the inner chamber of the valve body (1) has a guide passage (8) connected to the gas inlet;
the second end of the drive lever (5) is connected with a guide shaft (9);
a lower end of the guide shaft (9) is cooperated slidably in the guide passage (8);
the guide shaft (9) and the drive lever (5) are configured to swing relative to each other along a longitudinal direction of the drive lever (5);
a gas-through passage is between an outer wall of the guide shaft (9) and an inner wall of the guide passage (8);
the sealing gasket (6) is detachably connected to the lower end of the guide shaft (9);
a mounting shaft (22) is disposed at the second end of the drive lever (5);
the mounting shaft (22) extends along a width direction of the second end of the drive lever (5);
a mounting block (23) is disposed at an upper end of the guide shaft (9);
a horizontally-opening mounting fitting groove (24) is disposed on a sidewall of the mounting block (23); and
the mounting shaft (22) is fitted into the mounting fitting groove (24).