Ductile iron flow limiting check valve LH45X-16Q

LH45H flow-limiting check valve is mainly used for the parallel use of multiple pumps installed with the pump pressure outlet, to limit the working flow of the pump, to prevent the pump from stopping the role of reflux.

Product Features

• Supports pump work points within the high efficiency zone.
• Limit pump operation to high flow inefficiencies.
• No water hammer when closed.
• Prevents the pump from overloading the burnt ring motor.
• Stepless adjustment of head function.

Working Principle

1. Current limiting function: the valve is installed in the pump outlet, in the single pump startup and non-full design work pump work, more work pumps to limit the flow, so that the pump works in a more efficient state; to prevent the motor love pumps low head, large flow, low efficiency, overload phenomenon; to prevent the phenomenon of ultra-rated current burning the motor, and at the same time to play a certain energy-saving effect. The principle of limiting the flow is: based on the design of the pump head, the pilot valve automatically detects and controls the actual working head of the pump to limit the working flow of the pump, limiting the load of the motor. The valve is set to control a working air head, when the pump working head is lower than the control head when the valve to do the shut-off action, so that the actual working head increased; when the pump working head is greater than the set head when the valve is fully open, the valve resistance is very small. The setting of the control air head can be set according to the rated current of the motor, or set according to the high efficiency of the working conditions, the valve working head setting value is adjustable, the general factory setting value for the design of the working head.
2. Check function: the valve's check function is fully equivalent to the micro-resistance slow-closing check valve, and no closing noise, zero backflow. This valve is mainly used for the parallel use of multiple pumps when installed with the pump pressure outlet, to limit the pump flow, to prevent the pump from stopping the role of reflux. The valve adopts pilot valve - main valve structure, compact structure, light weight.

Product Parameters

Product Size Reference