One-way pressure activated piston seal
A solenoid actuated valve ( 10 ) holds pressure and volume of an accumulator with low leakage and provides low actuation drag during a release stroke for dumping fluid contents of the accumulator at very low current draw. Two elongate valve members ( 10 a, 10 b ) are assembled to be movable axially relative to one another with a gland or groove ( 10 c ) formed in one of the two valve members ( 10 a ). An o-ring ( 12 ) located within the groove ( 10 c ) is in a non-contacting relationship to the other valve member ( 10 b ) when in a non-energized state. An energizer ring ( 14 ) located within the groove ( 10 c ) can reciprocate axially with respect to the o-ring ( 12 ). The energizer ring ( 14 ) moves axially toward the o-ring ( 12 ) in response to fluid pressure against a surface ( 14 a ) of the energizer ring ( 14 ) opposite from the o-ring ( 12 ) to axially compresses the o-ring ( 12 ), causing the o-ring ( 12 ) to expand radially outwardly into sealing contact with the other valve member ( 10 b ).
1. A method for holding pressure and volume of an accumulator with low leakage and for providing low actuation drag during a release stroke of a solenoid actuated valve ( 10 ) for dumping fluid contents of the accumulator at very low current draw comprising:
providing a groove ( 10 c ) in one of two elongate valve members ( 10 a , 10 b ) movable axially with respect to one another;
positioning an o-ring ( 12 ) in the groove ( 10 c );
maintaining the o-ring ( 12 ) in a non-contacting relationship with respect to the other of the two elongate valve members ( 10 b ) when in a non-energized state; and
assembling an energizer ring ( 14 ) within the groove ( 10 c ) for axially reciprocal movement with respect to the o-ring ( 12 ), where the energizer ring ( 14 ) is axially movable toward the o-ring ( 12 ) in response to fluid pressure against a surface ( 14 a ) opposite from the o-ring ( 12 ) and the o-ring ( 12 ) being compressible by the energizer ring ( 14 ) thereby causing radial expansion of the o-ring ( 12 ) into sealing contact with the other of the two elongate valve members ( 10 b ) when in an energized state thereby sealing the solenoid actuated valve ( 10 ) in response to fluid pressure for holding pressure and volume of the accumulator with low leakage while the two elongate valve members ( 10 a , 10 b ) are stationary with respect to one another, where the o-ring is releasable from the energized state between the two elongate valve members ( 10 a , 10 b ) into the non-energized state in response to initial movement of a release stroke of the solenoid actuated valve ( 10 ) thereby providing low actuation drag during relative movement between the two elongate valve members ( 10 a , 10 b ) for dumping fluid contents of the accumulator at very low current draw.
2. The method of claim 1 further comprising:
providing the energizer ring ( 14 ) with a rectangular cross section.
3. The method of claim 1 further comprising:
providing the energizer ring ( 14 ) with an L-shaped cross section ( 14 b ).
4. The method of claim 1 further comprising:
providing the energizer ring ( 14 ) with an L-shaped cross section ( 14 b ) having an angled o-ring engaging surface ( 14 c ).
5. A one-way pressure activated piston seal comprising:
two elongate members ( 10 a , 10 b ) movable axially relative to one another with a groove ( 10 c ) formed in one of the two elongate members ( 10 a );
an o-ring ( 12 ) located within the groove ( 10 c ) formed in the one of the two elongate members ( 10 a ), while the o-ring ( 12 ) is maintained in a non-contacting relationship with respect to the other of the two elongate members ( 10 b ) when in a non-energized state; and
an energizer ring ( 14 ) located within the groove ( 10 c ) for axially reciprocal movement with respect to the o-ring ( 12 ), where the energizer ring ( 14 ) is axially movable toward the o-ring ( 12 ) in response to fluid pressure against a surface ( 14 a ) opposite from the o-ring ( 12 ) and the o-ring ( 12 ) being compressible by the energizer ring ( 14 ) to expand the o-ring ( 12 ) radially into sealing contact with the other of the two elongate members ( 10 b ) when in an energized state while the two elongate members ( 10 a , 10 b ) are stationary with respect to one another, where the o-ring is releasable from the energized state between the two elongate members ( 10 a , 10 b ) into the non-energized state in response to initial movement between the two elongate members ( 10 a , 10 b ) minimizing drag during relative movement between the two elongate members ( 10 a , 10 b ).
6. The seal of claim 5 , wherein the energizer ring ( 14 ) has a rectangular cross section.
7. The seal of claim 5 , wherein the energizer ring ( 14 ) has an L-shaped cross section ( 14 b ).
8. The seal of claim 5 , wherein the energizer ring ( 14 ) has an L-shaped cross section ( 14 b ) with an angled o-ring engaging surface ( 14 c ).
9. A solenoid actuated valve ( 10 ) for holding pressure and volume of an accumulator with low leakage and for providing low actuation drag during a release stroke of the solenoid actuated valve ( 10 ) for dumping fluid contents of the accumulator at very low current draw comprising:
two elongate valve members ( 10 a , 10 b ) movable axially relative to one another with a groove ( 10 c ) formed in one of the two elongate valve members ( 10 a );
an o-ring ( 12 ) located within the groove ( 10 c ) formed in the one of the two elongate valve members ( 10 a ), where the o-ring ( 12 ) is maintained in a non-contacting relationship with respect to the other of the two elongate valve members ( 10 b ) when in a non-energized state; and
an energizer ring ( 14 ) located within the groove ( 10 c ) for axial movement with respect to the o-ring ( 12 ), where the energizer ring ( 14 ) is axially movable toward the o-ring ( 12 ) in response to fluid pressure against a surface ( 14 a ) opposite from the o-ring ( 12 ) and the o-ring ( 12 ) being compressible by the energizer ring ( 14 ) causing the o-ring ( 12 ) to expand radially into sealing contact with the other of the two elongate valve members ( 10 b ) when in an energized state thereby sealing the solenoid actuated valve ( 10 ) in response to fluid pressure for holding pressure and volume of the accumulator with low leakage while the two elongate valve members ( 10 a , 10 b ) are stationary with respect to one another, the o-ring being releasable from the energized state between the two elongate valve members ( 10 a , 10 b ) into the non-energized state in response to initial movement of a release stroke of the solenoid actuated valve ( 10 ) thereby providing low actuation drag during relative movement between the two elongate valve members ( 10 a , 10 b ) for dumping fluid contents of the accumulator at very low current draw.
10. The valve ( 10 ) of claim 9 , wherein actuation of the solenoid actuated valve ( 10 ) unloads compressive pressure on the o-ring ( 12 ) allowing retraction from the radially expanded energized state to the non-contacting relationship with respect to the other of the two elongated valve members ( 10 a , 10 b ) in the non-energized state.
11. The valve ( 10 ) of claim 9 , wherein the energizer ring ( 14 ) has a rectangular cross section.
12. The valve ( 10 ) of claim 9 , wherein the energizer ring ( 14 ) has an L-shaped cross section ( 14 b ).
13. The valve ( 10 ) of claim 9 , wherein the energizer ring ( 14 ) has an L-shaped cross section ( 14 b ) with an angled o-ring engaging surface ( 14 c ).