the oil liquid of tube in the upper pump should be drained off during the whole barrel tubing type pump and special pump that usually be used in domestic workover treatment ,the work need the bottom of pump to connect a bleeder to be fullfilled.The working principle is :the bleeder shoud be connected to the bottom of pump and the upper part of standing valve, when the oil need be discharged during the oilfield work ,lift the sucker rod string and plunger assembly out of oil well ,put the impulse lever into the pipeline, the impulse lower down to the bottom and break off the draining pins of bleeder ,the upper oil liquid can be discharged through the draining pins.

 Puyang Zhongshi Group Company Ltd was founded in 1996,which is the restructured enterprise of Central Plains oilfield branch company of SINOPEC . The company registered capital is 6083 million yuan,with annual output value 200 million yuan, 580 employees, including more than 160 technical and administrative staff. Oil machinery is our main products, the leading products include pumping unit,subsurface sucker rod pump, wellhead (Christmas Tree), pressure vessels,drilling solid control series products and cementing accessories, We had attained ISO 9001 in 1998 and API Certificates in 2002 .

  The Design Manufacture of Pumping Uuits,Subsurface Sucker Rod Pump and Oil &Gas Extraction Wellhead Device,Produce of Well Cementation Accessory,Well Drilling Suspension Attachment,Sucker Rod,Pressure Vessel,Electric Motor,Low-Voltage Distribution Box Within 3C Qualification Scope,Mud Purification System and Shole Shaker and Related Environmental,Management Activies.