Safety device against overpressure particularly for gas pressure control apparatus
AssigneeBeta Corporation
InventorAdrianus M. J. Bruin
Life of this patent
Estimating the term…
Abstract
The high pressure of a gas transport network must be reduced before the gas is admitted to a distribution network to which consumers, e.g. household appliances are connected. This reduction is carried out by a gas pressure control installation. If this installation fails, conduit failure, appliance failure, explosion and fire may occur. A known safety device has a closing spring, which closes a valve if the gas pressure unacceptably rises which causes release of the spring by the gas pressure. The movement releasing the spring is influenced by friction which may have an uncertain value. The invention eliminates friction in that the reduced gas pressure acts on the valve via spring loaded membranes, namely a measuring membrane and an actuating membrane.
Claims11
A safety device against overpressure of a gaseous or liquid fluid, whereby a safety valve in a main supply conduit for the fluid is actuatable by means of a spring loaded actuating member mounted in a housing, e.g. a first membrane, the pressure to be controlled being connectable through an inlet conduit in the housing, characterized in that said inlet conduit communicates with a measuring chamber of a second or measuring membrane to which a first control valve is secured, said control valve in its closed position closing the communication between an actuating fluid source and an actuating chamber of the first or actuating member, a communicating conduit being provided between said measuring chamber and said actuating chamber, a second conduit providing communication between the actuating fluid source and said actuating chamber, a control port in said second conduit opening into said actuating chamber, and a second control valve secured to said actuating member and adapted to close said control port.
A safety device against overpressure of a gaseous or liquid fluid, whereby a safety valve in a main supply conduit for the fluid is actuatable my means of a spring loaded actuating member mounted in a housing, e.g. a first membrane, the pressure to be controlled being connectable through an inlet conduit in the housing, characterized in that said inlet conduit communicates with a measuring chamber of a second or measuring membrane to which a first control valve is secured, said control valve in its closed position closing the communication between an actuating fluid source and an actuating chamber of the first or actuating membrane, a communicating conduit being provided between said measuring chamber and said actuating chamber, a second control valve secured to said actuating member inserted in said communicating conduit between said measuring chamber and actuating chamber, a second communication conduit being provided between said chambers, said second conduit including said first control valve.
A safety device for closing and maintaining the closed condition of a fluid conduit upon occurrence of a fluid pressure greater than a predetermined fluid pressure therewithin, said device comprising:
- a safety valve in the conduit, a housing enclosing an actuating mechanism for said safety valve including spring means biasing said safety valve into a normally open position, said actuating mechanism including an actuating membrane disposed in an actuating chamber in said housing, said actuating membrane being responsive upon a pressure condition of said actuating chamber greater than said predetermined fluid pressure to effect closure of said safety valve, said housing including a measuring chamber containing a measuring membrane, spring means biasing said measuring diaphragm against the force of fluid pressure in said measuring chamber, conduit means providing fluid communication between the fluid conduit, said actuating chamber and said measuring chamber, an actuating fluid conduit in said housing communicating with a source of actuating fluid having a pressure greater than said predetermined pressure, normally closed control valve means connected to and operable by said measuring diaphragm for admitting actuating fluid from said actuating fluid conduit into said measuring chamber upon occurrence of a fluid pressure greater than the predetermined fluid pressure in said measuring chamber, the opening of said control valve means permitting actuating fluid to flow into and pressurize said actuating chamber to effect and maintain the closure of said safety valve, said control valve means upon opening being maintained in the open condition by the presence of said actuating fluid in the measuring chamber.
Dependencies are inferred from the claim text.