Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1998-08-17
2000-10-03
Phillips, Charles E.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
F16K 31143
Patent
active
061261394
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a valve unit for the evacuation and filling of media, especially liquids, in a system comprising a valve housing with at least two valve seats, where in one of said valve seats there is housed a valve part for evacuation, and where in said second valve seat there is housed a valve part for filling.
From the German utility model publication 91 06 946 there is known a system for the filling of coolant, and which comprises a control arrangement which regulates the activity and mutual relationship of the individual components, including a coolant valve and a negative-pressure valve. The publication does not provide a more detailed description of the valves' expedient configuration, but on the other hand it describes their positioning in relation to the system as a whole.
From EP-A-655.571 there is known a single valve which comprises a bore in which a slide is established, and which covers over through-flow holes for establishing a passage through the longitudinal channel in the valve. The activation of the valve's slide is exclusively manual, and is unsuitable for a function where it must both evacuate and fill a system.
From U.S. Pat. No. 4,869,300 there is known a valve arrangement, typically for use in refrigeration plants, and which includes a unit which serves in the establishing of vacuum in a reservoir, and also includes a unit which serves in the dispensing of the desired fluid, typically a coolant.
The valve is composed of many and movable components, which increases the risk of leakage. Moreover, it is provided with an internal slide which opens and closes for the inlet which, among other things, as a consequence of its positioning results in a considerable loss of pressure, and herewith limitation of the filling capacity and the evacuation level.
It is the object of the invention to provide a valve unit which does not suffer the disadvantages of the known technique, and where the valve unit is built up of separate filling and evacuation valve parts, each produced from a few units with only single movable parts, in a simple, small, handy construction, whereby the risk of leakage is minimal, and where there occurs only very little wastage of the transported fluid, among other things as a consequence of the greatly reduced number of movable parts.
This object is achieved with a valve unit of the kind disclosed in the introduction, and also where the valve part comprises a longitudinal channel and at least two communication holes extending from the longitudinal channel to the outer surface of the valve part, said channel being provided with a through-flow cut-off which divides the channel into two part-channels, a first and a second part-channel, said part-channels each comprising communication holes, and a slide arranged around the valve part, said slide having at least one recess in the surface facing towards the valve part and forming at least one sealed cavity, and where said slide is activated by the feeding of a gas or liquid medium to the valve seat.
In the case where the valve unit is to be used for the evacuation of a chamber, the one end of the valve unit is fastened to the chamber and the other end to a vacuum source. The slide is now placed over both of the communication holes and the vacuum is established. As a result of the through-flow being cut off, the communication to the chamber will take place from the first to the second channel via the slide's recess and the communication holes.
When the desired vacuum has been established, the slide is moved by means of air pressure or oil into a position in which it surrounds none or only a single communication hole. It is hereby ensured that the connection between the vacuum source and the chamber is closed.
The chamber is hereafter filled with a fluid, preferably a coolant, whereby the second valve unit for filling is activated, and where the slide is controlled into the open position as described above, and whereby this thus surrounds both communication holes. After the filling, the slide is placed in the closed positio
REFERENCES:
patent: 3425664 (1969-02-01), Niskin
patent: 4391103 (1983-07-01), Sarcia
patent: 4396154 (1983-08-01), Iovino et al.
patent: 4869300 (1989-09-01), Gudenau et al.
A Gramkow A/S
Phillips Charles E.
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