Pipeline diameter, pipe layout, check valve, flow rate,
Rational selection of the diameter of Voith gear pump pipeline should be considered comprehensively from the technical and economic point of view.
According to A&S Hydraulic Co., Darcy, Ltd's R&D department,
1. Voith gear pump should pay attention to the following points when designing and arranging pipelines:
A. Reasonable selection of the pipe diameter of Voith gear pump will lead to a sharp increase in the resistance loss, increase the head of the selected pump, increase the matching power, and increase the cost and operating cost under the same flow rate, small liquid flow velocity and small resistance loss, but the price is high and the pipe diameter is small. Therefore, it should be considered from the perspective of technology and economy.
B. The discharge pipe and its joint shall take into account the maximum pressure they can withstand.
C. Pipeline layout should be arranged as straight as possible to minimize the accessories and length of the pipeline. When turning, the bending radius of the elbow should be 3-5 times the diameter of the pipeline and the angle should be as large as 90 C.
D. Pump discharge side must be equipped with valves (ball valves or globe valves, etc.) and check valves. The valve is used to regulate the working point of the pump. The check valve can prevent the pump from reversing when the liquid is flowing back, and prevent the pump from being hit by the water hammer. (When the liquid flows backward, it will produce a huge reverse pressure, which will damage the pump.)
2. Effect of Flow Head of Voith Gear Pump
Flow determination
A. If the minimum, normal and maximum flow rate has been given in the production process, the maximum flow rate should be considered.
B. If only normal flow rate is given in the production process, a certain margin should be considered.
For large flow and low head pumps of ns100, the flow allowance should be 5%, for small flow and high head pumps of ns50, the flow allowance should be 10%, for pumps of 50 < ns < 100, the flow allowance should also be 5%. For pumps of poor quality and poor operating conditions, the flow allowance should be 10%.
C. If the basic data are only given to the weight flow rate, it should be converted to the volume flow rate.