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Printable Version
Seaboard International Model 640 and Model 1640 gate
valves are designed with a bi-directional slab gate, metal-to-metal sealing
technology, and stem backseating capability. The one-piece parallel sided
slab gate utilizes floating seats that co-opt line pressure to supply
the sealing force. Stem packing is chemically inert, using spring energizing
rings which require no adjustment or plastic injection. These valves are
available for applications from 3,000 to 15,000 psi. Trim levels are available
to suit all types of oil and gas service. Flanged end configurations are
available in standard bore sizes from 1-13/16 through 5-1/8.
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Key Features:
Metal-to-Metal Seals
- Seals are stable, thermally insensitive, and environmentally
resistant
- Utilized in the gate/seat, body/ bonnet, and stem/bonnet
backseat
Selective Backseat
- Provides unparalleled safety during venting, lubrication,
and stem packing replacement
- Premature backseating is prevented by a positive stop in
the bearing cap that controls stem travel. This design feature
also protects the metal-to-metal sealing surface
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- Allows stem packing replacement without removing valve from
service
- Backseat can be employed without shifting position of the gate
Slab Gate
- Excessive force is not required to close
and seal the valve
- Potential for valve cavity pressure lock
is eliminated
- Assures smooth operation during extreme thermal
cycles
Floating Seats
- Allows bi-directional use
- Spring-energized seals pre-load the seats
to maintain constant contact with gate, ensuring low pressure
sealing
- Requires no lubrication to seal
Threaded Packing Gland
- Transfers stem packing loads to the
bonnet, protecting the bearing assemblies
- Accommodates replacement of bearings and shear
pin at full pressure differential
No Body Penetration
- A single lubrication injection port is located
above the backseat in the bonnet allowing cavity lubrication or
venting of trapped pressure after backseat operation
Non-Rising Stem
- Reduces tearing of stem packing
- Acme thread enhances durability and
lowers torque requirements
Stem Shear Pin
- Protects valve stem from being damaged due
to excessive torque
In-line Repairability
- A routine maintenance program keeps repairs
to a minimum. Should repairs be necessary, vital valve components
may be replaced
- Gates, seats, stems and other critical parts
are easily replaced without the use of special tools
- Stem packing can be replaced while the valve
is under pressure
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