39results about How to "Realize holding pressure" patented technology

The invention discloses a gas flow control device. A control gas passage is arranged in a body of the gas flow control device, one end of the control gas passage is connected with a cavity in the body, the other end of the control gas passage is connected with a cavity at a gland end of a connecting rod, and the gas flow control device is additionally provided with an auxiliary gas sac. When the gas flow control device is used for inflating, gas flow blocks a gas return passage, an inflating gas passage is opened, and one-way inflation is realized; when gas returns, the gas flow blocks the inflating gas passage, and the gas return passage is smoothly opened under the effect of the auxiliary gas sac; and when either inflation or gas return is not required, the gas flow control device can realize a pressure maintaining function.

The invention relates to a fast multi-directional multifunctional hydraulic control valve, which includes a valve core, a valve body and a valve seat, wherein the valve core is arranged in the inner cavity of the valve body, and the valve seat is fixed on the The upper end of the body; the valve core is provided with a differential hole, which causes a pressure difference between the upper and lower ends of the valve core; the valve seat is provided with a control hole, and the differential hole, the upper cavity of the valve core and the control hole are connected; When the hydraulic valve is opened, the hydraulic oil in the main oil circuit forms an oil circuit through the differential hole, the upper cavity of the spool and the control hole; when the control hole is closed, the spool is on the upper part of the spool The cavity moves under the action of high-pressure hydraulic oil to close the hydraulic control valve. The hydraulic control valve of the present invention is provided with a differential hole, which is quick in response and sensitive, and can also realize pressure maintenance.

The invention provides an in-situ preserving coring system and method, and belongs to the field of in-situ mechanical research of rock masses. The coring system comprises a coring drilling tool and rock core preserving equipment, the coring drilling tool comprises a drill bit and a drilling tool body connected with the drill bit, a pressure testing device is arranged on the portion, close to the drill bit, of the side wall of one end of the drilling tool body, and a temperature testing device and a humidity testing device are arranged above the pressure testing device; the rock core preserving equipment comprises an equipment body, a core storage tube capable of freely sliding in the equipment body in the axial direction is arranged in the equipment body, the core storage tube is a hollow cavity and is used for storing rock cores subjected to drilling, the outer wall of the equipment body is provided with a pressure preserving device, a heat preserving device and a humidity preserving device which are connected with the core storage tube respectively, and a ball valve connected with the front end of the equipment body is further included. The ball valve is switched on, rock core drilling is conducted, the drilled rock cores gradually enter the core storage tube along with drilling of the coring drilling tool, after rock core drilling is completed, the ball valve is switched off, and the drilled rock cores are stored in the sealed core storage tube. The in-situ preserving coring system and method are suitable for mechanical property research of the rock masses.