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GE Oil & Gas
Masoneilan* 28000 Series
Varipak
Precise Microflow Valves with Compact Design
*
Control Valves
fact sheet
Created specifically for low flow applications, the Masoneilan
28000 series Varipak control valve from GE provides excellent
throttling control performance with a wide range of options
and capabilities to meet your specific needs. Designed with an
extremely integrated and compact assembly, the valve’s key
design features include:
Heavy Top-Guiding
To promote excellent plug stability and control even under
high-pressure drop conditions an integrated plug guide and seat
ring provides rugged valve plug support along the entire stroke
length. Heavy guiding is critical for controlling vibration damage,
providing dependable control and seating performance, and
minimizing trim mechanical wear.
Application Flexibility
One size hardly ever fits all applications. That’s why the Varipak
valve offers the flexibility of 10 standard contoured trim designs
based on the same body platform. These multiple trim sets help
reduce the effects of valve oversizing and improve control loop
performance, resulting in better process efficiency.
Adjustable Flow Coefficient (CV)
Anti-Cavitation Trim
The Varipak valve is available with an effective high-pressure, liquid let-down, anti-cavitation trim solution – the Varilog* trim. This
unique design includes a multi-stage axial flow plug and liner,
which provides dirt-tolerant operation and high wear resistance.
Design Flexibility
Other standard configurations include a high-pressure ASME
Class 2500 design, a zero-emissions Bellows seal design, and a
design for cryogenic applications. The Varipak valve is also available with an angle body design to accommodate existing piping
configurations.
Ease of Maintenance
The Varipak control valve’s simple, top-entry, body construction
includes an integrated body and bonnet design, which allows for
easy access and removal of the quick change trim. The integral
liner and seat ring construction reduces the number of components, simplifying assembly and disassembly. In addition, the
modular actuator design further enhances the maintainability of
this unique valve assembly.
With the valve’s adjustable Cv option, you can easily accommodate changing operating conditions. The Cv value can be
increased or decreased simply by setting a knob within the
actuator assembly
Compact Assembly
The Varipak control valve’s modular design and force amplification actuator technology enabled its space saving, compact
assembly. In addition, the actuator includes a low-profile, topmounted hand wheel option.
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28000 Series Varipak
Microflow Control Innovation
Optimized CV Characteristics
The VariPak valve outshines conventional microflow valves with
its support of a wide range of nominal Cv values (from 0.0016 to
3.8), using only eight plugs and five seats.
Standard Flangeless Design
Due to its simple, compact, and versatile stainless steel body
design, the standard flangeless Varipak valve is widely used
across a variety of industries. Optionally, the valve is available in
a flanged configuration (see the Masoneilan 28000 Varipak TechSpec for complete details).
Standard Flangless
Varipak Control
Valve
Optional Flanged
Varipak Control
Valve
Varilog* Anti-Cavitation Trim Design
The Varilog multi-stage trim design for the Varipak control valve provides
unmatched anti-cavitation performance in low flow applications.
By reducing erosion and vibrations, this design helps minimize failure
that is often associated with conventional single-seated valves. The
Varilog trim is available with the standard Varipak body designs in either
the flanged or flangeless configurations.
High Pressure Design
The high-pressure Varipak valve design is recommended for
applications involving conditions with very high upstream pressure or pressure drop that exceeds the pressure rating of the
standard Varipak body design..
Varilog Trim Subassembly
High Pressure Varipak
2 | GE Energy
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Bellows Seal Design
For applications that require zero leakage at the packing box, the
Varipak valve is available with a Bellows seal. This design is ideal
for applications that involve the handling of flammable, toxic, or
explosive fluids.
Cryogenic Design
Simplified maintenance requirements
This Varipak control valve design meets the requirements of
cryogenic processes that require thermal insulation. An insulating interface sets up between the valve body (cold zone) and the
body extension located in the higher temperature area (warm
zone). The valve body assembly and its thermal extension are positioned inside the cold box, and the plug can easily be removed
and inspected without disturbing the valve body. This eliminates
the need for any preliminary, complicated dismounting, and
more importantly, prevents any interference with the cold box.
fact sheet
Bellows Seal
Varipak
Control Valve
Body Design
Manufactured from a material suitable for low temperatures, the
valve body maintains ductility in service. It can be conveniently
mounted to suit specific piping needs as long as the angle between the valve axis and vertical does not exceed 60°.
Designed to prevent leakage of cryogenic fluid into the insulated
zone, the body gasket is outside of the cold zone and the bonnet
is located away from the fluid.
Body extension
To reduce the inflow of heat by conduction, thin-walled metal
tubes are used for the body extension and coupling sleeve. In
addition, the annular space is reduced in order to exclude convection currents.
Plug
The design of the plug allows the working parts to be accurately
centered in relation to the seat and provides a uniform temperature zone for the guiding.
Cryogenic Varipak
Control Valve
Masoneilan 28000 Series Varipak | 3
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Specifications
fact sheet
Body
Type: globe style
angle style optional
Sizes: 1" (DN 25) standard
1/2" (DN 15) and 3/4" (DN 20) optional
Materials: Standard: type 316L St. St.
Optional: Monel®, Hastelloy® C,
Alloy 20, others
Options: Flanged valve
Anti-cavitation Varilog
High pressure
Bellows seal
Cryogenic
Angle valve
NACE version
Accessories and Options
Pneumatic Positioner (Model 7700P)
Type
pneumatic, force balance
Mounting
built-in bracket in actuator
Action
direct: increasing instrument signal
increases air output
Characteristics
linear
Instrument signal
3 to 15, 6 to 30 or 3 to 27 psi
200 to 1000, 400 to 2050 or
200 to 1850 mbar)
3 to 9, and 9 to 15 psi
(200 to 600 and 600 to 1000 mbar)
split range
Connections
1/4" NPT instrument and supply –
1/8" NPT output
Average air consumption
0.15 scfm at 30 psi supply
(0.26 Nm3/h at 2.1 bar supply)
Max. air output
4.20 scfm (7 Nm3/h)
Supply pressure effect
0.05% of full stroke variation per
psi supply pressure change
(0.07% per 100 mbar)
Open loop gain
70
Linearity
± 0.5%
Sensitivity
0.1%
Repeatability
0.1%
Full stroke time
less than one second
Weight
3.3 lbs (1.5 kg)
Other Accessories
Proximity sensors and limit switches
Digital positioners – HART® and
Fieldbus Foundation
Handwheel, airsets and solenoid valves
Trim
Plug type: contoured, heavy top guided
multi-staged anti-cavitation (Varilog) optional
Seat type: metal seat
CV ratio: 500:1 at max. C
Flow characteristics: linear (trim No. 0 to 5)
modified linear (trim No. 6 to 9)
Flow Direction: flow-to-open
flow-to-close optional
200:1 at min. C
V
V
Actuator
Type: spring-opposed rolling diaphragm
Action: direct or reverse, easily performed without
additional parts
CV adjustment: optional adjustable knob/lever
Handwheel: optional top mounted
Air connection: 1/8" NPT
Electropneumatic Positioner (Model 7700E)
Type
electropneumatic, force balance
Mounting
compact, without external linkage
to the actuator
Action
direct: increasing instrument signal
increases air output
Characteristics
linear
Instrument signal
4-20 mA
Air Connections
1/4" NPT supply – 1/8" NPT output
Average air consumption
0.24 scfm (0.4 Nm3/h)
Electrical connections
1/2" NPT or M20
Weight
7.7 lbs (3.5 kg)
Hazardous Location Protection
ATEX Approvals (94/9/EC Directive)
Explosionproof
No. SIRA 02 ATEX 1274
Intrinsic Safety
No. SIRA 02 ATEX 2277 X
FM (Factory Mutual) Approvals
Explosionproof
Intrinsic Safety
Non-incendive and
Dust-ignitionproof
CSA Approvals
(Canadian Standards Association)
Explosionproof
Intrinsic Safety
Non-incendive
* Masoneilan, Varipak, and Varilog are trademarks of the General Electric Company.
© 2012 General Electric Company. All rights reserved.
Other company names and product names used in this document are the registered
trademarks or trademarks of their respective owners.
GEA19370 10/2012
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