FIELD: deep-well sucker-rod pumps.
SUBSTANCE: proposed device consists of hollow housing installed between cage of upper valve, with seat and ball, and cage of lower valve, with seat and ball. Housing has cylindrical bore accommodating ring piston with hollow rod to form ring chamber. Hollow rod and housing are furnished with throttling channels connecting axial channel of hollow rod through ring chamber with outer surface of housing. Spring-loaded bushing with head and calibrated shear element is telescopically fitted in ring piston. Ring chamber is formed between bushing and housing. Said ring chamber communicates with axial channel through radial holes.
EFFECT: improved reliability in operation, increased service life.
4 dwg
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