Ductile Iron Flow Limiting Check Valve LH45X-16Q

Product Description

The LH45X flow limiting check valve is primarily used in parallel pump systems, where it is installed at the pump discharge outlet to limit the pump’s operating flow rate and prevent backflow when the pump is shut down.

Product Features

1. Ensure that the pump operates within the high-efficiency range.
2. Limit the operation of the pump under conditions of high flow rate and low efficiency.
3. There is no water hammer when the valve is closed.
4. Prevent the pump from overloading and burning out the motor.
5. Stepless head adjustment function.

How It Works

1. Flow Limiting Function: Installed at the pump outlet, this valve limits flow when a single pump is started or when not all designed operating pumps are in use, enabling the pumps to operate at higher efficiency; it prevents motor overload when the pump operates at low head, high flow rate, and low efficiency; it prevents motor burnout due to current exceeding the rated value; and it also provides some energy-saving benefits. The flow-limiting principle is as follows: Based on the pump’s design head, the pilot valve automatically detects and controls the pump’s actual operating head to limit the pump’s flow rate and reduce the motor’s load. The valve is set to a control head; when the pump’s operating head falls below the control head, the valve closes to increase the actual operating head; when the pump’s operating head exceeds the set head, the valve opens fully, resulting in minimal valve resistance. The control air head can be set based on the motor’s rated current or on high-efficiency operating conditions. The valve’s operating head setting is adjustable; the factory default setting is typically the design operating head.
2. Check Valve Function: The check valve function of this valve is identical to that of a low-resistance slow-closing check valve, with no closing noise and zero backflow. This valve is primarily installed at the discharge outlet of a pump in a multi-pump parallel configuration to limit the pump’s operating flow rate and prevent backflow when the pump is shut down. The valve features a pilot-operated main valve design, offering a compact structure and relatively light weight.

Product Specifications

Product Size Guide