Safe start check valve for fire pump

Abstract

The invention relates to a safe start check valve for a fire pump. A resistance adjusting and releasing mechanism is arranged in a valve body and comprises a valve clack, a valve rod, a spring, a hydraulic damper and a resistance adjusting screw, wherein the valve rod is connected with the valve clack; one end of the valve rod in the resistance adjusting and releasing mechanism is connected with the hydraulic damper; a guide sleeve is arranged outside the valve rod and the hydraulic damper; the other end of the valve rod is fixed on the valve clack; and one end of the valve rod, which is connected with the hydraulic damper, is in sliding fit with the guide sleeve. As the resistance adjusting and releasing mechanism with a spring is arranged in the valve body, a liquid medium in the pipeline is prevented from flowing backwards, and influence of pressure fluctuation of a water hammer is reduced; since the valve clack has a hollow thin-shell structure and light weight, the motion inertiaof the valve clack can be reduced, the valve clack can quickly start when closed, and the impact noise caused when the valve clack is closed can be reduced; and moreover, the valve provided by the invention has the advantages of small volume, light weight and beautiful appearance, low noise, is safe and reliable and can be installed at any angle and position.

Description

technical field [0001] The invention relates to a control valve, in particular to a fire pump safety start check valve, which is applied to a liquid medium pipe network system. Background technique [0002] The application of water pumps has brought huge benefits to industrial and agricultural production and urban construction. The start and stop of water pumps is the key link for its safe use. Gradually open the outlet valve. In order to prevent the backflow of the liquid medium in the pipeline system after the pump is stopped, a check valve must be installed at the outlet of the pump, and an elimination device for reducing the impact of water hammer fluctuations must be installed. The national "Technical Regulations for the Application of Water Supply and Drainage Pump Control Valves" stipulates that when the pump is directly started and stopped directly, a control valve should be installed on the pump outlet pipe. [0003] The fire pump is a special category of water pum...

AI Technical Summary

Problems solved by technology

However, the structure of this control valve is relatively complicated, and it needs to be controlled by a regulating valve, which needs to be further improved and improved.

At present, there is no report on the development and use of a special fire pump safety start check valve, so there is a prospect for further improvement and innovation of the traditional water pump check valve

Images