Safety level low leakage quick isolation valve

Abstract

The invention discloses a security level low-leakage quick isolating valve which comprises a valve body, a valve seat, a butterfly plate, a butterfly plate rotating shaft, a connecting rod mechanism, a drive device, a rubber seal ring and a limiting mechanism. The valve body is provided with a bearing pedestal, the rubber seal ring is arranged on the valve seat, the two ends of the butterfly plate rotating shaft are arranged on the bearing pedestal of the valve body, the butterfly plate is installed on the butterfly plate rotating shaft, and the drive device drives the butterfly plate rotating shaft to rotate through the connecting rod mechanism. The security level low-leakage quick isolating valve is characterized in that a drive rotary arm is arranged on the drive device and connected with the connecting rod mechanism through a spindle head connecting rod; a 90-degree rotatory pneumatic or electric actuating mechanism is adopted in the drive device. The security level low-leakage quick isolating valve is compact in structure, the drive device can be installed on various positions, and maintenance and operation of the isolating valve are convenient.

Description

technical field [0001] The invention relates to a special valve for isolating medium used in an industrial ventilation and air-conditioning system, in particular to a safety-level low-leakage quick isolation valve. Background technique [0002] At present, this type of isolation valve is mainly used in the ventilation and air conditioning system of nuclear fuel plant. The existing isolation valve products all use straight-stroke pneumatic actuators to control push rods, and cannot use 90-degree rotary pneumatic or electric actuators, which seriously lack the interaction of driving devices. Changing, weakening its versatility. Foreign countries use multi-turn electric actuators for this type of product. This structure is to install the electric actuator directly on the push rod, thereby generating a huge torque on the air valve. The air valve with this structure lacks safety and reliability. [0003] In the invention patent CN101358655A published on February 4, 2009, a recta...

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Problems solved by technology

[0002] At present, this type of isolation valve is mainly used in the ventilation and air conditioning system of nuclear fuel plant. The existing isolation valve products all use straight-stroke pneumatic actuators to control push rods, and cannot use 90-degree rotary pneumatic or electric actuators, which seriously lack the interaction of driving devices. changeability, weakening its versatility

Foreign countries use multi-turn electric actuators for this type of product. This structure is to install the electric actuator directly on the push rod, thereby generating a huge torque on the air valve. The air valve with this structure lacks safety and reliability.

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