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Embodiments of a gate valve equalization system comprise: a gate valve; a gate; a preloading valve arrangement; a floating coupler assembly; a relief valve arrangement; and a means for control. The preloading valve arrangement permits fluid to enter the valve body from the upstream side of the gate.

Embodiments of a gate valve equalization system comprise: a gate valve; a gate; a preloading valve arrangement; a floating coupler assembly; a relief valve arrangement; and a means for control. The preloading valve arrangement permits fluid to enter the valve body from the upstream side of the gate. The means for control serves as a control interface allowing engagement of the floating coupler assembly and opening/closing of the gate valve. Engagement of the floating coupler, engages the assembly relief valve arrangement and allows redistribution of fluid pressure and circulation of fluid from one side of the gate to opposing side of the gate within the gate valve.

대표청구항 ▼

1. A gate valve pressure equalization system comprising: a gate valve; a gate mounted in said gate valve, wherein said gate is movable between open and closed positions; a preloading valve arrangement; a floating coupler assembly further comprising a slide nut and a lift arm; a relief valve arrangem

1. A gate valve pressure equalization system comprising: a gate valve; a gate mounted in said gate valve, wherein said gate is movable between open and closed positions; a preloading valve arrangement; a floating coupler assembly further comprising a slide nut and a lift arm; a relief valve arrangement; and a means for control further comprising a stem attached to a handwheel, wherein said stem is centrally disposed through said floating coupler assembly; wherein axial rotation of said stem causes movement of said slide nut, and wherein movement of said slide nut causes said lift arm to engage said relief valve arrangement, thereby allowing redistribution of fluid pressure between opposing sides of said gate. 2. The gate valve pressure equalization system of claim 1, wherein said gate valve is sealed by a bonnet; said gate valve having a valve body, a valve body chamber, an upstream cavity, and a downstream cavity. 3. The gate valve pressure equalization system of claim 1, wherein an upstream ring member and downstream form a seal against said gate, within said valve body. 4. The gate valve pressure equalization system of claim 1, wherein said gate has an equalizing port, a coupler receiver, a gate cavity, and a stem cavity. 5. The gate valve pressure equalization system of claim 4, wherein said gate has a grease port. 6. The gate valve pressure equalization system of claim 1, wherein said preloading valve arrangement comprises a preloading relief port and a check valve, proximate to an upstream side of said gate valve. 7. The gate valve pressure equalization system of claim 6, wherein said check valve comprises a check valve body; a check valve seal tip; a check valve retainer; a check valve spring; a check valve nut; and a check valve escape port. 8. The gate valve pressure equalization system of claim 6, wherein said check valve is aligned with said preloading relief port, proximate to on an upstream side of said gate valve. 9. The gate valve pressure equalization system of claim 8, wherein fluid passes from said upstream side of said gate valve through said preloading relief port, through said check valve, and into said gate valve upon the introduction of fluid under pressure from said upstream side of said gate valve. 10. The gate valve pressure equalization system of claim 1, wherein said preloading valve arrangement comprises a preloading relief port and a plurality of check valves. 11. The gate valve pressure equalization system of claim 1, wherein said floating coupler assembly further comprises a gate nut, a stop bolt, and a lift arm lock. 12. The gate valve pressure equalization system of claim 1, wherein said floating coupler assembly is non-fixedly attached to said gate. 13. The gate valve pressure equalization system of claim 1, wherein said relief valve arrangement comprises: an insert body; a relief bolt; a stem seal; a spring nut; a lock nut; a relief cavity; a return spring; and a relief port. 14. The gate valve pressure equalization system of claim 13, wherein said relief port extends from an upper surface of said gate to a downstream surface of said gate at an approximate 90° angle. 15. The gate valve pressure equalization system of claim 13, wherein said relief port extends from an upper surface of said gate to a downstream surface of said gate at an approximate 45° angle. 16. A gate valve pressure equalization system comprising: a gate valve; a gate mounted in said gate valve, wherein said gate is movable between open and closed positions; a preloading valve arrangement permitting fluid to enter said gate valve from an upstream side of said gate valve; a floating coupler assembly non-fixedly attached to said gate, said floating coupler assembly further comprising a slide nut, a gate nut, a stop bolt, a lift arm, and a lift arm lock; a relief valve arrangement, and a means for control, wherein said means for control actuates said floating coupler assembly to engage said relief valve arrangement, thereby allowing redistribution of fluid pressure between opposing sides of said gate. 17. A gate valve pressure equalization system comprising: a gate valve having a valve body chamber depending through said gate valve, said gate valve permitting fluid transfer from an upstream cavity of said gate valve to a downstream cavity of said gate valve; a gate movable between open and closed position, said gate positioned within said valve body chamber to form a pressure fluid seal between said upstream cavity and said downstream cavity; a preloading valve arrangement allowing fluid to enter said gate valve from said upstream cavity through a check valve and preloading relief port; a floating coupler assembly having a slide nut, a gate nut, a stop bolt, a lift arm, and a lift arm lock; a relief valve arrangement having an insert body, a relief bolt, a stem seal, a spring nut, a lock nut, a relief cavity, a return spring, and a relief port; a handwheel attached to a stem, wherein axial rotation of said stem causes movement of said lift arm, thereby unseating said stem seal, which allows fluid circulation between upstream and downstream sides of said gate, and wherein further axial rotation of said stem causes movement of said gate within said valve body chamber.