Top & Bottom Guided Control Valves, ANSI 150-600 Class
Reliable and Proven Technology
for the 2lst Century
The Top &
Bottom Guided Control Valve design has been successfully applied for over 50 years in
chemical, refining, power, paper, and H.V.A.C. industries worldwide. Typical applications
include clean and dirty liquids, gases and steam.
Solution-Engineered Features for Demanding
1. Top & Bottom Stem Guiding:
The valve plug is supported and rigidly guided by upper and
lower guide bushings. This two-point guiding provides for exceptional stability and
minimal valve plug deflection even under high pressure drop conditions, and allows for
precise control and characterization of fluid.
2. High Capacity Body Designs: The body
configuration incorporates large flow areas which maximize the flow capacity of each size.
This enlarged flow area maintains acceptable fluid velocities in the valve body, which
increases trim life and provides for quieter operation.
3. Balanced Double Port Design: Since
inlet pressure exerts force on the upper and lower plugs, the forces are balanced. This
balancing effect reduces the net thrust of the actuator, allowing for smaller actuators to
be used in higher pressure drop applications. The result is a lower overall installation
cost and dimensional envelope.
4. Plug Throttling Design: Plug
characterization, stem guiding, and balancing effect give this design the combination best
suited for handling dirty, sticky, and erosive applications in refinery plants where cage
guided valves have consistently failed.
5. Field Reversible Trim: EQ% V-Port
EQ%, Linear and Quick Opening Contoured plugs are easily reversed in the field so that
either a fail open or closed action can be obtained using the same actuator. This reduces
the need for parts inventory, and adds flexibility.
6. Sizes and End Connections: The
GTB valve is available in sizes 1" through 16" (25-400 mm). End connections
include raised face, ring type joint flanges and threaded ends.
7. Bonnet Options: Bonnet options
include the standard bolted configuration and extension bonnet for temperatures below 32'F
(O'C) and above 450'F (232'C). The standard and extension bonnets are available with
lubricator and oversized construction.
8. Packing: TeflonO Chevron/Braided
TeflonO Graphite (TC/BTG) Split rings allow packing replacement without removal of
actuator. Graphite impregnated PTFE provides 500'F (260'C) service temperature, lowered
stem hysteresis, better "memory" and sealing than pure teflon rings, and is
ideal for fluids that contain suspended solids.
VARCOfor all your valve needs.
Please feel free to contact us with any questions about our products.
Thank you for visiting!
VALVES & CONTROLS, CO.
P.O. Box 630277 Houston, TX 77263-0277