Pressure regulator
View Patent ↗A variable device for regulating the outlet pressure of a fluid from a valve body, includes a pressure-sensing chamber having a wall formed by a resilient self-restoring diaphragm which is responsive to pressure in the chamber. A valve element connected to the diaphragm controls flow into the chamber. Increased pressure in the chamber decreases the flow into the chamber and decreasing pressure increases flow whereby fluid flow out from the chamber is maintained at a desired pressure. The outlet pressure is adjusted by deflecting the diaphragm in a direction to open the valve while permitting a section of the diaphragm connected to the valve member to remain responsive to the pressure in the chamber. An adjustment cover is provided to adjustably deflect the diaphragm and includes a catch mechanism to allow adjustment of the fluid outlet pressures and also retain the device at a desired value. An indicator arrangement may be provided to visually indicate the fluid outlet pressure.
1. A variable pressure regulator control device comprising:
a valve body having a fluid inlet, a fluid outlet, a fluid pressure-sensing chamber, and a valve seat in fluid communication with said inlet and defining an opening into said chamber;
a unitarily-formed resilient member comprising a wall portion, a valve stem portion and a valve element portion, said wall portion forming a wall of said chamber which is responsive to pressure in said chamber and which is self-restoring, said valve stem portion extending through said chamber towards said valve seat and said valve element portion cooperating with said valve seat, said valve element portion being located between the valve seat and said fluid inlet;
an adjuster mounted to said valve body, said adjuster adapted to deflect said resilient member away from said valve seat in response to pressure changes within said chamber;
a cover fixing said adjuster for rotation therewith such that the amount of deflection of said resilient member is capable of being adjusted by rotation of said cover.
2. The device of claim 1 , wherein the resilient member is composed of an elastomer.
3. The device of claim 1 , further comprising a catch mechanism defining a plurality of positions relative to said valve body, the catch mechanism configured to position the cover in one of said plurality of positions.
4. The device of claim 3 , wherein the catch mechanism comprises a plurality of recesses defined by one of said valve body and said cover, and at least one projection fixed in relation to the other of said valve body and said cover, said at least one projection configured to engage one of said plurality of recesses.
5. The device of claim 4 , wherein the at least one projection is biased into engagement with the recess such that rotation of said cover is inhibited in the absence of rotational torque on said cover and rotation of cover is permitted in response to rotational torque on said cover.
6. The device of claim 5 , wherein said recesses are defined by the valve body and the at least one projection is fixed for rotation with the cover, said cover additionally comprising at least one flexible tab portion, wherein said at least one projection is defined by a surface of said flexible tab portion.
7. The device of claim 6 , additionally comprising an indicator arrangement configured to relate an angular position of said cover with respect to said valve body to a predetermined fluid outlet pressure.
8. The device of claim 1 , wherein the valve element portion of the resilient member is substantially spherically shaped.