The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1987
Filed:
May. 01, 1986
Amnon F Vadasz, Caracas, VE;
Intevep, S.A., Caracas, VE;
Vereinigte Edelstahlwerke A.G., Vienna, AT;
Oficina Tecnica HGB, Estado Miranda, VE;
Abstract
In a subsurface positive displacement pump used in the petroleum industry for pumping crudes characterized by a high degree of suspended solid particles, a ball check valve comprising a valve ball and a valve seat assembly wherein the valve seat assembly comprises a hollow cylindrical body defining an orifice through which pumped fluid passes, the hollow cylindrical body being provided with a recess on the surface facing the valve ball in the region defining the orifice wherein an insert which forms the actual valve seat for the ball valve is secured in the recess. The insert is formed of a material having a hardness greater than the hardness of the material from which the cylindrical body is formed and the material from which the valve ball is formed is characterized by a high resiliency, a modulus of elasticity of between 0.1.times.10.sup.6 psi to 15.times.10.sup.6 psi and a hardness greater than that of the hollow cylindrical body.