Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1996-02-20
1998-06-30
Michalsky, Gerald A.
Fluid handling
Line condition change responsive valves
Direct response valves
251253, 2513352, F16K 700
Patent
active
057719241
DESCRIPTION:
BRIEF SUMMARY
DE-GM 90 06 840 discloses a valve used in particular as a safety valve in heating and hot water systems. The spring force exerted by the pre-tensioned spring on the valve body ensures that the valve body is pressed against the valve seat in a sealing manner. However, if the pressure prevailing in the system exceeds a maximum value determined by the spring force of the spring, the valve body moves away from the valve seat, and the excess pressure in the system can escape automatically. In order to prevent water or vapour leaving the system from passing into the space of the valve in which the spring and the valve body are located, said space is separated from the passage by means of a flexible diaphragm. The diaphragm is fixed to the valve body and a circumferential portion of the diaphragm is fixed to the housing of the valve. In the case of safety valves it is essential to be able to check the operation of the valve by hand. For this purpose, the rotary knob is then operated, with the result that the valve body is moved briefly from the valve seat.
In the case of this known embodiment, the valve body is connected to the rotary knob by means of a connecting rod situated on the main axis of the valve. The rotary knob is provided with cam followers which can interact in such a way with guide elements immovably fixed to the housing of the valve that when the rotary knob is turned it moves a distance away from the housing, and in the course of said movement takes the valve body with it and lifts it off the valve seat.
This known valve has the disadvantage that when the valve body reaches the closed position again, the rotary knob moves towards the housing again, and there is a considerable risk of the operator having part of his hand or fingers caught to some extent between the rotary knob and the housing. Furthermore, when the rotary knob is being turned, a torque is exerted on the diaphragm, which can become damaged as a result. Also, it is a disadvantage that, due to its above-described design, the known safety valve can also be operated by pulling the turning knob. The chance of this occurring accidentally is considerably greater than if manual operation of the valve were possible only by turning the rotary knob. Finally this known valve is composed of an undesirable large number of parts.
The object of the invention is to eliminate the abovementioned disadvantages and to provide a valve which can be operated without any problem, and which is composed of a small number of parts which are easy to produce and assemble.
This object is achieved by a valve of the type mentioned in the preamble, which is characterized in that the wall extending between the spring seat and the valve seat is provided with one or more slots which extend substantially in the direction of the main axis of the valve and guide the boss or bosses of the valve body protruding through the slots, and in that the rotary knob is provided with means which can engage under one or more bosses of the valve body, which means can interact with the boss or bosses of the valve body in such a way that when the rotary knob is turned, the valve body is moved away from the valve seat.
This ensures that on turning of the rotary knob the means disposed thereon move under the at least one projecting boss of the valve body, and on further turning of the rotary knob they force the valve body upwards. The rotary knob itself does not move in the direction of the main axis, away from the housing. When the valve body moves away from or towards the valve seat, the valve body is guided in the direction of the main axis of the valve as the boss or bosses provided on the valve body protrude through the slot(s). The sliding of the bosses of the valve body in the slots prevents a torque from being transmitted to the valve body when turning the rotary knob.
The valve body is preferably provided with a plurality of bosses, disposed at equal intervals in the peripheral direction, and the rotary knob has a wall situated outside the bosses and around the main axis of the v
REFERENCES:
patent: 2664265 (1953-12-01), Howser
patent: 4103704 (1978-08-01), Richards
Flamco B.V.
Michalsky Gerald A.
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