Fluid handling – Convertible – Reversible check
Patent
1995-12-18
1998-06-30
Chambers, A. Michael
Fluid handling
Convertible
Reversible check
137271, 251148, 251367, F16K 3900
Patent
active
057719187
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for connecting an output pipe to a valve incorporated in a fluid pressure circuit or the like.
2. Discussion of the Background
Heretofore, there have been used valves for controlling the direction in or the rate at which a fluid under pressure flows, e.g. directional control valves, in fluid pressure circuits or the like. Such a directional control valve comprises a supply port, an output port, a discharge port, a valve body having a valve hole defined therein which communicates with these ports, and a valve member slidably disposed in the valve hole. When the valve member slides in the valve hole, the valve member connects the output port selectively to the supply port and the discharge port for connecting fluid passages to each other.
The output port of the directional control valve is open at an upper surface of the valve body, and a pipe joint is attached to the output port for connection to an output pipe such as a tube or the like. The output port is defined in the upper surface of the valve body for the layout of a communication passage between the outlet of the valve hole and the output port. Specifically, in view of the layout of the supply and discharge ports that are defined in a lower surface of the valve body, the output port is defined in the upper surface of the valve body to allow the communication passage between the outlet of the valve hole and the output port to be formed easily and inexpensively.
However, there are instances where the output pipe should preferably be connected to a front surface of the valve body depending on the location and attitude of the directional control valve and the manner in which the operator operates the directional control valve.
If the output port is defined in the front surface of the valve body to meet the above demand, however, the directional control valve suffers following disadvantages: First, it requires a considerable number of manufacturing steps and a high manufacturing cost to produce a communication passage between the output port in the front surface of the valve body and the outlet of the valve hole. Secondly, the user has to keep a plurality of types of valve bodies in stock in order to make available directional control valves of different structures, one having a valve body with an output port open at its upper surface and one having a valve body with an output port open at its front surface, with the result that a large expenditure of expenses will be required and the valve inventory control will be complicated. Thirdly, since the direction in which the output pipe is connected is limited to the upper surface of the valve body, if the environment in which the directional control valve is installed presents an obstacle near the upper surface of the valve body, then there will be difficulty in laying the output pipe.
SUMMARY OF THE INVENTION
The present invention has been made in order to solve the above problems. It is an object of the present invention to provide a valve output pipe connecting device which allows an output pipe to be connected to one valve body from its upper or front side, for thereby reducing a valve manufacturing cost, facilitating valve inventory control, lowering an expenditure of expenses, and permitting the output pipe to be laid simply without limitations posed on the direction in which it is connected.
With a valve output pipe connecting device according to the present invention, when a pipe joint is connected to a valve output port in an upper surface of a valve body, the pipe joint allows an output pipe to be connected to the valve body from its upper side.
When a pipe adapter is connected to the valve output port, a pipe joint connected to an adapter output port of the pipe adapter allows an output pipe to be connected to the valve body from its front side.
Therefore, selective connection of the pipe joint and the pipe adapter to the valve output port makes it possible to connect the output pipe to the same valv
REFERENCES:
patent: 3215158 (1965-11-01), Bass, Jr. et al.
patent: 3677577 (1972-07-01), Krauer et al.
patent: 3698432 (1972-10-01), Kutz
patent: 4140144 (1979-02-01), Dowd et al.
patent: 4247133 (1981-01-01), Moller
Doi Yoshitada
Fukano Yoshihiro
Chambers A. Michael
SMC Kabushiki Kaisha
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