Reducer valve for pressurized gas
View Patent ↗A reducer valve for pressurized gas includes a piston ( 2 ) displaceably mounted in a valve housing ( 3 ) against the force of a pressure spring ( 8 ). At one end, the piston ( 2 ) is subjected to pressure by the back pressure via a control pressure line ( 20 ) whereby the gas, which flows in from a pressurized gas source via a gas inlet ( 17 ), is throttled. The reducer valve is improved so that a specific gas volume remains in the connected pressurized gas source below a minimum pressure. A directional valve ( 24, 25 ) is provided in the control pressure line ( 20 ) and opens above a predetermined limit pressure.
1. A reducer valve for pressurized gas, the reducer valve comprising:
a valve housing having an inner wall surface defining an interior space;
a piston displaceably mounted in said interior space of said valve housing;
a pressure spring interposed between said housing and said piston for imparting a biasing force to said piston;
said piston including a first piston section having a first outer diameter and a second piston section having a second outer diameter greater than said first outer diameter;
said piston including a piston inner space defining a valve seat and a pressurized gas inflow channel leading to said valve seat; and, a valve body configured to close said valve seat;
said valve body being operatively connected to said valve housing and mounted in said piston inner space so as to be displaceable relative to said piston;
said inner wall surface and said second piston section conjointly defining a control pressure space;
said housing having an outlet opening for conducting said pressurized gas to a consumer and said outlet opening communicating with said control pressure space;
said piston having a control pressure line formed therein for connecting said control pressure space to said piston inner space so as to allow said pressurized gas to flow from said piston inner space to said control pressure space;
said control pressure space being dimensioned so as to cause said second piston section to be subjected to a resultant force because of said pressurized gas which resultant force counters the force of said pressure spring and causes a movement of said piston and therefore of said valve seat toward said valve body thereby throttling the flow of said pressurized gas flowing in via said inflow channel; and,
a directional valve at said control pressure line with said directional valve opening toward said control pressure space above a predetermined limit pressure whereby a specific minimum pressure is maintained in said inflow channel.
2. The reducer valve of claim 1 , wherein said control pressure line terminates in a valve opening in said control pressure space; and, said directional valve includes said valve opening and an elastomeric annular member which closes said valve opening.
3. The reducer valve of claim 2 , wherein said directional valve has an opening pressure equal to or greater than 1 bar.
4. The reducer valve of claim 2 , wherein said directional valve consists of said valve opening and an elastomeric annular member which closes said valve opening.