Slowly-open slowly-close fully-open and vibration-free swing check valve

Abstract

The invention relates to a slowly-open slowly-close fully-open and vibration-free swing check valve, and belongs to the technical field of valves. The swing check valve comprises a valve body, a valve deck arranged on the valve body, a valve shaft arranged at the upper end, close to a water inlet, inside the valve body, and a valve clack fixedly connected to the valve shaft. The valve shaft penetrates through the valve body and stretches out of the valve body, a locking arm is fixed to the inner side of the valve clack, and the part, stretching out of the valve body, of the valve shaft is connected with a first driving device; the valve body is provided with a rotating shaft, the part, located in the valve body, of the rotating shaft is fixedly connected with a locking hook used for hooking the locking arm, and the part, stretching out of the valve body, of the rotating shaft is connected with a second driving device. The swing check valve plays a role in sealing and checking, and also has a locking function. The swing check valve has valve closing and opening functions, when a system operates normally, a valve closure member, namely the valve clack, can be fully opened, water damage of the system is reduced, energy resources are saved, and shaking of the valve clack is small after the valve is opened.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a slow-opening and slow-closing full-opening vibration-free swing check valve. Background technique [0002] At present, the existing swing check valves with slow closing (two-stage valve closing) capability are generally divided into three categories: pneumatic type, hydraulic type and electric type. Pneumatic slow-closing swing check valves require special air sources and DC equipment, so the application occasions are too limited. The electric slow-closing swing check valve needs to be associated with the water pump due to power-on and power-off. Once a non-accidental power failure occurs, the valve cannot automatically check and loses the function of the protection system. [0003] The hydraulic slow-closing swing check valve has the following disadvantages: it does not have the function of closing the valve to start, and it is generally required to close the valve to start wh...

AI Technical Summary

Problems solved by technology

The electric slow-closing swing check valve needs to be associated with the water pump due to power-on and power-off. Once a non-accidental power failure occurs, the valve cannot automatically check and loses the role of the protection system.

[0003] The hydraulic slow-closing swing check valve has the following disadvantages: it does not have the function of closing the valve to start, and it is generally required to close the valve to start when the centrifugal pump is working. The existing hydraulic swing slow-closing check valve does not have This function requires manual adjustment of the external pressure of the slow closing device to meet the pressure requirements of the slow closing device when the system pressure changes, that is, when the system pressure increases, the relative external pressure increases accordingly, and the system pressure changes. When the system is operating normally, the valve closing part (disc) cannot be fully opened, and the valve closing part will occupy the valve flow channel, which will increase the water loss of the system and waste a lot of energy in the system. Moreover, the disc will vibrate continuously after the valve is opened, so the valve shaft is very prone to fatigue damage; when the system is operating normally, the valve closing part (valve disc) cannot be fully opened, and the valve closing part will occupy the valve flow passage, and the pressure of the system will The fluctuation drives the disc to vibrate, and the vibrating disc causes the valve shaft to swing at a small angle, resulting in severe local wear of the valve shaft system and even failure of the valve seal

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