US 11,927,308 B2
Differential pressure opening and excess flow closing valve for gas cylinder
Stephan Sellen, Wehingen (DE); and Philippe Schmitz, Steinsel (LU)
Assigned to ROTAREX S.A., Lintgen (LU)
Appl. No. 17/630,406
Filed by Rotarex S.A., Lintgen (LU)
PCT Filed Jul. 17, 2020, PCT No. PCT/EP2020/070366
§ 371(c)(1), (2) Date Jan. 26, 2022,
PCT Pub. No. WO2021/018642, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 101328 (LU), filed on Jul. 26, 2019.
Prior Publication US 2022/0282836 A1, Sep. 8, 2022
Int. Cl. F17C 13/04 (2006.01); F16K 17/30 (2006.01)
CPC F17C 13/04 (2013.01) [F16K 17/30 (2013.01); F17C 2203/0636 (2013.01); F17C 2205/0329 (2013.01); F17C 2205/0385 (2013.01); F17C 2223/0123 (2013.01); F17C 2223/036 (2013.01); F17C 2227/048 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A valve for a fluid, said valve comprising:
a body with an inlet, an outlet and a passage fluidly interconnecting the inlet and outlet;
a shut-off device housed in the body and configured for selectively opening and closing the passage, the shut-off device comprising
a main seat,
a main closing element configured for cooperating with the main seat and forming a channel extending there through and a pilot seat,
a pilot closing element housed in the main closing element and configured for cooperating with the pilot seat,
a first compression spring operatively mounted between the pilot closing element and the main closing element, and
a second compression spring configured for biasing the main closing element towards the main seat; and
an actuating device configured for moving the pilot closing element away from the pilot seat and opening the passage through the channel and, once a counter-pressure has built up downstream of the main closing element, move the main closing element away from the main seat,
wherein the second compression spring is operatively mounted between the main closing element and the body and, at least in a shut-off state of the shut-off device, the first compression spring is stronger than the second compression spring.