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Plug Valve


Weco Plug Valves
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Body erosion virtually eliminated Choice of operators, actuators
Gear operators, pneumatic actuators, and hydraulic actuators are available. Fluid is f

orced between the plug/seal interface, limiting wear to replaceable parts.

Low torque operation at all pressures Ultimate sealability, no adjustments required
Floating plug improves sealability and reduces plug wear. Cylindrical plug fits between seal and side segments, reducing plug drag on the valve body.

Weco ULT and DR plug valves are premium, quarter-turn valves designed for
a wide range of standard and sour gas drilling, production, and well-servicing applications. These rugged valves are offered in single and dual-body designs in pressures to 20,000 psi. They range in size from 1 to 4-inches and come with threaded, Weco wing union, flanged ends, or combinations thereof. Consult factory for configurations.
PV1

Weco Plug Valves
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ULT Plug Valves
he benefits of FMC Fluid Control’s ULT plug valves are a direct result of its unique design features. Combined, these features have redefined the standards for plug valve operating principles and performance.

T

Ultimate Seal Life
In addition to improved valve body life, two other frequent operating problems associated with high-pressure plug valves – both of which cause premature damage to seals and increased valve operating torque – are solved by the ULT plug valve. Traditional plug valve designs can sometimes seal on the upstream side of the valve, resulting in extrusion damage to the upstream segment seal. Traditional plug valves can also trap body pressure after line pressure is removed from the valve, resulting in extrusion damage to both upstream and downstream segment seals. The dual-seal design of the ULT plug valve, by forcing flow between the plug and segment interface, eliminates both of these problems.

Ultimate Sealability
The key to the ULT plug valve’s unprecedented seal integrity is its proprietary floating plug and dual-seal design. When the valve is closed, the dual segment seal provides the sealing reliability of redundant sealing members on the downstream side of the valve. In 3" and larger sizes, the ULT plug valve also employs a two-piece plug and stem design. When these valves are closed, line fluid pressure in the body is equalized around the plug resulting in ultimate sealing and low operating torque.

Ultimate Valve Body Life
In addition to improved bi-directional seal performance, the ULT plug valve dramatically extends service life. When a traditional plug valve is closed, high-pressure fluids are forced between the upstream body and seal segment interface. This flow path can erode the valve body, potentially ruining the valve. When a ULT plug valve is closed, the only available flow path is between the seal segment and plug interface. This flow path eliminates body erosion and limits any potential wear to replaceable components.

Ultimate Life Cycle Cost Savings
Superior sealability, increased life of valve body, and elimination of premature seal damage result in significant savings in life cycle costs of the ULT plug valve over traditional plug valves. Qualification tests have proven that the ULT plug valve extends service life 3 to 5 times over other plug valves while reducing maintenance costs. In smaller sizes, ULT parts kits may be used in existing DR plug valve bodies to extend the life of these valves.

OPERATING PRINCIPAL
Top view — Valve open
Line fluid

Top view — Valve closed

Floating plug

Proprietary seal design

Floating plug

Proprietary seal design

PV2

Weco Plug Valves
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ULT Plug Valves (3-inch and larger)
Recommended service
Slick water, sand, proppant/gel, and cement

Handles sand, proppant, and cement
Linear wave springs prevent small particles from entering metal-to-metal seal area, enabling use in a broad range of applications.

Two-piece floating plug/stem
Proprietary floating plug and stem uniformly distribute load against the downstream seat to improve sealability and reduce plug wear.

Fast, simple field repair
Bottom entry design provides access to all valve internals without having to remove the operator or actuator.

Eliminates body washout, extends body life
Dual seals direct flow between the seal segment and plug to provide long, trouble-free service life.

ULT Plug Valves (below 3-inch)
Recommended service
Slick water, sand, proppant/gel, and cement

Eliminates body washout, extends body life
Dual seals direct flow between the seal segment and plug to provide long, trouble-free service life.

Fast assembly
Integral stem and plug provide fast, sure assembly without adjustments.

Simple repair
Radial cut side and seal segments simplify repair, saving time and money.

Eliminates corrosion in segment sealing area
Dual segment seals greatly reduce erosive fluid flow between the seal segments and the plug valve body to improve sealing capabilities and extend service life.

See Specifications Tables (page PV1A) for sizes, dimensions, weights, materials, and part numbers.

PV3

Weco Plug Valves
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Specialty ULT Plug Valves
The ULT plug valve’s proven, proprietary design technology enables customers to take advantage of a wide range of configurations for a host of specialty applications. Options include single and dual body designs; drill pipe, Weco union, or flanged end connections; and side outlets. Consult factory for specific applications.

ULT Dual Body Plug Valves
(Weco Union x Flanged End Connections)

ULT Dual Body Plug Valves
(Drill Pipe Connections)

ULT Flanged Plug Valves
(Flanged End Connections)

See Specifications Tables (page PV1A) for sizes, dimensions, weights, materials, and part numbers.

PV4


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