Gate valves are on/off control devices used during drilling, completion and production of oil and gas wells. They are designed to be operated in either the fully open or fully closed position. Gate valves are not chokes and should never be used for throttling.
- Gate valves are positioned primarily in two places on conventional wellhead assemblies; in the wing position of casing heads, casing spools, or tubing spools; or in a Christmas tree assembly
- Generally speaking, gate valves that are installed in the wing position of the lower sections of well-head assemblies, are called annulus valves
- The valves that are installed on the upper sections of wellhead assemblies, are called Christmas tree or production gate valves.
- These valves can be either manually operated or mechanically actuated
Features:
◆ Gate & Seat Design for Slab Gate
Gate Valve was developed to satisfy the need for a high quality reliable valve which is reasonably priced. All Gate valve makes full use of modern materials and manufacturing techniques. It is easy to maintain, conforms to international design requirements and Quality Assurance Programme. All Valves are manufactured to API 6A Specification as a basic minimum, in a Plant that is API Q1 and ISO9001 approved and Certified.
◆ Forged or Cast Body & Bonnet
All type gate valve bodies and bonnets are manufactured from forged or cast AISI 4130/4140 low alloy or AISI 410 SS steel. Other materials for extreme service, such as Inconel or Duplex stainless steel are available to order.
◆ Metal-to-Metal Seat to Body Interface
Precision lapped faces between the gate and seat ensure a metal-to-metal pressure tight seal is maintained. Seat is lapped on both surface to give a true metal to metal seal between the body and seat. This seal is further reinforced and protected by a Teflon or Viton lip seal, giving bubble tight sealing performance at pressure below 10 psi.
◆ Gate & Seat Design for Slab Gate
The seat in the gate valve are fully floating, this combined with a solid slab gate gives a true downstream seal resulting in exceptionally low operating forces.
◆ Bi-directional Sealing
All Gate Valve is a true bi-directional valve. Being fully symmetrical, it will effectively seal pressure from either direction without the risk of pressure lock. If the valve is used in uni-directional application, the gate and seats can be reversed to give a extra service life.
◆ Gate Guided
The gate is guided positively by the valve body and close fitting stainless steel skirts. The skirts minimize the ingress of well fluid mud and sand into the body cavity.
◆ Body to Bonnet Seal
A metal-to-metal seal is achieved between the body and bonnet using metal-to-metal sealing technology. The seal ring is re-useable.
◆ Non-rising Stem with Backseat
The stem used in the Douson gate valve is manufactured from Alloy-Nitrided or 17-4 stainless steel. Being of the non-rising design, valve operation will not increase the pressure in the body cavity. Seal against the bonnet, providing means to replace the valve stem packing with the valve is under pressure.
◆ Stem Seal
All stem seals are non-elastomeric and are inert to most known liquids and gases. Being made from PTFE/R-PTFE stem frictional resistance is minimized resulting in lower operating torque. The stem seal design is suitable for all temperature range and services. Graphite stem packing is option on user request.
◆ Bearing
Heavy duty thrust bearing are used to absorb stem thrust and reduce operating torque. A grease fitting is located on the bearing cap to allow for lubrication to ensure continued trouble-free operation.
Material Specification for API 6A Valve
FC Type Gate Valves
FC gate valve features a non-rising stem with a slab gate, floating seat ring body bushing design to provide safe dependable service. It is available in flanged ends in standard bore sizes from 1-13/16” through 7-1/16” in working pressures of 3,000 psi ~ 15,000 psi.
Full-Bore Thru-Conduit Design
- Maximizes valve service life
- Eliminates the collection of destructive particles
Floating Slab Gate and Seats
- Produces a positive pressure energized seal
- Body pressure equalizes across the seat ring/ body bushing, eliminating body erosion in the seat pockets
Metal-to-Metal Seals
- Body/bonnet interface, gate/seat ring/body bushing interfaces, body/body bushing interface
In-line Repairability
- Seat rings, body bushings, gate, stem are easily replaced in the field
Metal-to-Metal Backseat
- Allows for body pressure containment in the case of stem packing leak
Long Life, Low Maintenance
- Simple routine maintenance program limits repairs, eases operation, protects against corrosion, and extends service life
High Pressure Gate Valves for Fracturing Service
Yancheng Cyber offers BSO (Ball Screw Operators) on FC/FLS high- pressure gate valves. It is available in flanged ends in standard bore sizes from 2-1/16” through 7-1/16” in working pressures of 10,000 psi and 15,000 psi.
Double acting hydraulic gate valve also available.
Reduced Torque
- Reduces torque as much as 50%
- 2 Heavy duty thrust bearings assist in further reducing overall torque
Fewer Turns to Fully Open/Close Full-Bore Thru-Conduit Design
- Maximizes valve service life
- Eliminates the collection of destructive particles
Floating Slab Gate and Seats
- ”T”slotted gate allows the gate to float, reducing deflection and binding
- Produces a positive pressure energized seal
- Body pressure equalizes across the seat ring/ body bushing, eliminating body erosion in the seat pockets
Metal-to-Metal Seals
- Body/bonnet interface, gate/seat ring/body bushing interfaces, body/body bushing interface
In-line Repairability Metal-to-Metal Backseat
Long Life, Low Maintenance
- Simple routine maintenance program limits repairs, eases operation, protects against corrosion, and extends service life
BSO (Ball Screw Operators)
Gate Valve
Hydraulic Gate Valve
WKM Type Expanding Gate Valves
Yancheng Cyber’s WKM type gate valve features a non-rising stem with an expanding gate design to provide safe, dependable service in a variety of environments. It is available in flanged or threaded ends in standard bore sizes from 2-1/16” through 4-1/16” in working pressures of 3,000psi through 5,000 psi.
WKM type gate valves in sizes 7-1/16” in working pressures of 3,000 psi through 5,000 psi working pressure are available upon request.
Full-Bore Thru-Conduit Design
- Maximizes valve service life
- Eliminates the collection of destructive particles
Expanding Gate
- Produces a positive mechanical seal across the seats
- Isolates the body cavity from bore pressure in both the open and closed position
Press Fit Seats
- Press fit seats allow the seats to be tightly wedged into the seat pockets in the open or closed position
Metal-to-Metal Seals
- Body/bonnet interface, and gate/seat interface
In-line Repairability
- Stem packing is re-energize while the valve is under pressure
Long Life, Low Maintenance
- Simple routine maintenance program limits repairs, eases operation, protects against corrosion, and extends service life
Mud Valves
Mud Valves are solid gate, rising stem, gate valves with resilient seals. They are purpose made for mud, cement, fracturing.
Application
- Oil and Gas lines
- Wellheads
- Manifolds and Pipelines
- Crude Oil and Sour Gas
- Well Treating Chemicals
- Drilling Chemicals
- Water Flood Lines
- Abrasive Drilling Mud
Design Specification
- Design specifically for Abrasive and Erosive use
- All Valves have 17-4 PH Stainless Steel Stems
- API 6A PSL1, 2 and 3 available
- Gate can be supplied in Nickel-plated Carbon Steel, Monel, Aluminum Bronze or Stainless Steel.
- Stainless or Carbon Steel Inserts with Nitrile or HNBR Elastomer
- Pressure Tested in Accordance with API 6A or API 6D
- Sour Service Models to NACR MR-01-75
- Available with Pressure Ratings up to 5000 psi in 2”, 3”, 4”, 5” * 4” and 6” * 4” Valves Sizes
- 75000 psi Valves To Cater for High Pressure Demands Placed open Modern Drilling Mud Systems in Sizes 2”, 3”, 4”, 5” and 6”
- Connection can be flanged, butt-weld, thread, weco union
