Pumps – With condition responsive pumped fluid control – Bypass or relief valve part carried by or carries...
Patent
1981-05-18
1983-10-04
Gluck, Richard E.
Pumps
With condition responsive pumped fluid control
Bypass or relief valve part carried by or carries...
417311, F24B 4908
Patent
active
044076401
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates to a reciprocating pump, and, more particularly, it relates to a reciprocating pump which has provided, at the foremost or front end of a cylinder supporting a freely reciprocable plunger, a suction passage, a discharge passage, a valve gear comprising a suction valve and a discharge valve, and a pressure control valve, all located so that the plunger reciprocates to actuate the suction valve and discharge valve to thereby discharge pressure fluid while the pressure control valve adjusts pressure within the discharge passate to a desired value.
BACKGROUND OF THE ART
Conventionally, a reciprocating pump which is provided with a pressure control valve device so as to adjust fluid pressure within a discharge passage in a desired value is well-known.
The conventional pressure control valve device is so constructed that a valve seat and a valve body are assembled into a valve box formed separately from the main body of the reciprocating pump. A spring housing cylinder is provided within the valve box, and this cylinder supports a control spring biasing the valve body to the valve seat as well as an adjuster for adjusting the biasing force of the control spring. The pressure control valve device is disposed at a halfway position within the discharge passage of the pump so that the valve box communicates at the inlet side thereof with the discharge passage, while the outlet side of the valve box communicates with a hose open to the atmosphere.
The pressure control valve device, to date, which is separate from the main body of the pump, is complex in construction and increases the number of necessary parts. This results in a pump which is complicated to assemble, expensive as a whole to manufacture, and larger in size and weight.
Another well-known pressure control valve device employs an unloader valve instead of a relief valve. When the unloader valve is used, the pressure control valve device becomes more complex in construction which leads to a higher manufacturing cost.
This invention has been designed to overcome these problems. A main object of the invention is to provide a reciprocating pump capable of adjusting pressure within the discharge passage in a set value, thereby reducing the number of parts and facilitating its assembly.
Another object of the invention is to provide a reciprocating pump simple in construction and capable of immediately unloading the liquid discharged from the discharge passage when the pressure within the discharge passage reaches the set value.
DISCLOSURE OF THE INVENTION
The present invention is characterized in that a pressure control valve is supported to a valve seat bearing at least one of a suction valve and discharge valve actuated by reciprocation of a plunger, the control valve is disposed at a discharge passage formed at a cylinder and biased to the valve seat by means of a control spring, and a pressure adjuster supporting the control spring is mounted on the cylinder so as to be movable. The pressure control valve is adapted to be assembled by use of the cylinder, thereby eliminating the aforesaid conventional problems in the assembly of a valve box separate from the main body of the pump.
Furthermore, the foregoing reciprocating pump is provided at the outer periphery of the pressure control valve with a pressure-receiving portion having a pressure-receiving area larger than that of a pressure-receiving face of the control valve within the discharge passage, while a pressure chamber is provided between the pressure-receiving portion and the cylinder, a check valve is interposed in the path of a liquid delivery conduit communicating with an outlet of the discharge passage, and a by-pass conduit is provided at the liquid delivery conduit at the outlet side of the check valve so that the by-pass conduit communicates with the pressure chamber. Hence, the pressure control valve is formed as an unloader valve of simple construction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic longitudinal sectional view of an
REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2726032 (1955-12-01), Cooper et al.
patent: 3255954 (1966-06-01), Norlin et al.
Arimitsu Industry Co., Ltd.
Gluck Richard E.
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