ANTI-GAS-LOCK CHECK VALVE
The invention relates to an anti-gas-lock check valve for subsurface pumps in mechanical pumping technologies (formed by a surface unit, a rod string, and a subsurface pump), which eliminates gas lock, reduces fluid pound and prevents sticking due to solids in the subsurface pumps. The anti-gas-lock check valve is formed by four main parts: a nut; a spring; a bell; and a body with production holes. During the downward movement of the travelling valve or in the event of the system stopping, the spring which is supported on the nut constantly exerts a downward force on the bell, forcing the bell to sit on the body, thereby closing the production holes. Consequently, the anti-gas-lock check valve prevents the pressure of the hydrostatic column inside a well from being exerted on the travelling valve of the subsurface pump during the downward movement of the system or in the event of the system stopping.