Packing for equalizing reservoir cut-out valve

In a valve having a housing, a bore in said housing, a valve seat in said bore, a bore in said valve seat, a plunger movable in said bore in said valve seat, a first packing means providing a seal between said valve seat and said housing, said first packing means being subjected to differential pressure reversals, the improvement comprising:

• a second packing means spaced from said first packing means and adjacent thereto between said valve seat and said housing and providing a seal between said valve seat and said housing;
• a means for eliminating differential pressure reversals across said first and second packing means by connecting the space between said first and second packing means to a fixed value of pressure outside said housing;
• third and fourth adjacent packing means, spaced along said plunger for sealing said plunger and said bore in said valve seat;
• and
• a channel interconnecting said space between said third and fourth packing means to said space between said first and second packing means which in turn is connected to said means for eliminating differential pressure reversals.

In a valve having a housing, a bore in said housing, a valve seat in said bore, a first packing means providing a seal between said valve seat and said housing, said first packing means being subjected to differential pressure reversals, the improvement comprising:

• a second packing means spaced from said first packing means and adjacent thereto between said valve seat and said housing and providing a seal between said valve seat and said housing;
• means for eliminating differential pressure reversals across said first and second packing means by connecting the space between said first and second packing means to a fixed value of pressure;
• and
• wherein said valve includes a plunger movable in a bore in said valve seat, a pair of packing means spaced along said plunger, and a channel interconnecting the space between said pair of packing means to said means for eliminating differential pressure reversals.

In an equalizing reservoir cut-out valve having a housing, a bore in said housing, an equalizing reservoir control pipe port, an equalizing reservoir port, a control port, a check valve for permitting flow from said reservoir port to said control pipe port, a valve seat for said check valve in a bore in said housing, a plunger responsive to pressure at said control port for opening said check valve to permit flow from said control pipe port to said reservoir port, and packing means subject to differential pressure reversals between said reservoir port and said control port, the improvement being said packing means which comprises:

• a first packing means being exposed on a first side to said control port;
• a second packing means spaced from said first packing means and adjacent thereto between said valve seat and said housing and being exposed on a first side to said reservoir port, wherein said first and second packing means seal said valve seat to said housing;
• means interconnecting the space between said first and second packing means to a fixed value of pressure for eliminating differential pressure reversals across each of said first and second packing means;
• and
• wherein said plunger slides in a bore in said valve seat, and including a third and fourth adjacent packing means spaced along said plunger for sealing said plunger and said bore in said valve seat, a first side of said third packing means being exposed to said control port and a first side of said fourth packing means being exposed to said reservoir port, and said means also interconnects the space between said third and fourth packing means to said fixed valve of pressure for eliminating differential pressure reversals across each of said third and fourth packing means.