Typically, the pump catalog are given [Hs] value (pump suction on the vacuum height) or (NPSH) r value, is at standard atmospheric pressure Pa (Pa = 1.033kg / cm2 = 10.33mH2O) and a temperature of 20 ℃ water (when Pv = 0.024kg / cm2 = 0.24mH2O) under the circumstances, 40ZJ-I-A17 mechanical seal, the pump of the test result, it is (NPSH) r] and [Hs converted by the following equation: (NPSH) r = 10.09- [Hs] + Vs2 / 2g m (1-11) where: Vs- pump suction velocity m / s; Sealing form: EZJ series slurry can expeller seal combined with packing seal and mechanical seal in two forms. (1) Vice impeller dynamic seals: Vice impeller seal by pressure impeller and the repeller seal produced in series, 50ZJ-I-A33 mechanical seal, packing or lip seals as a parking seal. The first stage pump is a positive pressure pump inlet pump outlet pressure is not greater than the value of 10% of the single-stage or multi-stage pump series, you can use this seal form. It can be run without the seal of water, mechanical seal, not diluted slurry, good sealing effect and the like. But it will increase (usually takes about five percent increase in shaft power) power consumption. Packing seal is a common form for a variety of working conditions, can be matched PTFE packing, graphite packing and other special materials, it can be used for corrosive or high temperature conditions. It has a simple structure and easy maintenance. Mechanical seal, 50ZJ-33 mechanical seal, slurry (quality businessmen) are provided by Shijiazhuang-Pump Co., Ltd. faction. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) is specialized in "slurry pumps, submersible pumps, sewage pumps, chemical pump, pulp pump, water pump, mud pump, multi-stage" of the enterprise, the company of " honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Xu.