Summary

The valve pressure testing machines of model PZ series are a new type of valve testing equipments, which are the patent products designed and developed by our company and specially used for testing valves by means of bore (internal) sealing way. The machine is mainly composed of three parts, that is, the mechanical system, the electric system and the testing medium (water) cycling system, without the hydraulic system. And the machine is made up of main parts, such as electric motors, thrust screws, transmitting nuts, tie bars etc., without the hydraulic control system. Electric speed reducers or actuators are adopted as the motors to drive the transmitting nuts and make the thrust screw going forwards and backwards. The practicability of the machine is completing both shell test and seat test after only one time of clamping, which is convenient and quick for valve testing. What is most important, the valve to be tested can be sealed well by bore (internal) sealing way, which causes no external force on the valve to be tested. The maximum bearing force of the machines we can design and manfucture is up to 5000 Tons. And so far the largest machine of this series we have manufactured can test ball valves up to 72", 600LB.