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Mark Six Cryogenic Service
Control Valves
General information .................................................. 2
Unpacking ................................................................ 2
Installation ................................................................ 3
Quick-check ............................................................. 3
Startup ..................................................................... 3
Valve maintenance .................................................... 3
Disassembling the actuator................................... 3
Disassembling the plug ......................................... 3
Replacing the soft seat ......................................... 4
Inspecting the seat ring......................................... 4
Reassembly of the Mark Six ................................. 4
Removing the actuator ......................................... 6
Reassembling the actuator ................................... 6
Troubleshooting ........................................................ 7
Terms concerning safety
The safety terms DANGER, WARNING, CAUTION and NOTE are used
in these instructions to highlight particular dangers and/or provide
additional information on aspects that may not be readily apparent.
DANGER: indicates that death, severe personal injury and/or
substantial property damage will occur if proper precautions
are not taken.
WARNING: indicates that death, severe personal injury
and/or substantial property damage can occur if proper
precautions are not taken.
CAUTION: indicates that minor personal injury and/or
property damage can occur if proper precautions are
not taken.
NOTE: indicates and provides additional technical information,
which may not be very obvious, even to qualified personnel.
Compliance with other, not particularly emphasized notes, with
regard to transport, assembly, operation and mainte nance and
with regard to technical documentation (e.g., in the operating
instruction, product documentation or on the product itself) is
essential, in order to avoid faults, which might directly or indirectly
cause severe personal injury or property damage.
VLENIM0006-03 (AQ) July 2019
Mark Six Cryogenic Service Control Valves
General information
The following instructions are designed to assist in unpacking, installing
and performing maintenance required for the Valtek Mark Six cryogenic
service control valves.
To avoid possible injury to personnel or damage to valve
parts, WARNING and CAUTION notes must be strictly
adhered to. Modifying this product, substituting non-factory
or inferior parts, or using maintenance procedures other
than outlined herein could drastically affect performance,
void product warranties, and be hazardous to personnel
and equipment.
The Valtek Mark Six is a globe-style, single-seat, top-entry valve with a
fabricated cold box extension for use in cryogenic applica tions down to
-253°C (-423°F). Body weight is kept to a minimum to reduce boil-off
during valve cool-down. The extension design permits easy access
and removal of the valve trim through the cold box. The Mark Six
utilizes a spring-energized PTFE seal or a small vent hole through the
plug seal area to permit only a small amount of liquefied gas into the
bonnet areas, where it vaporizes and pro vides a vapor barrier between
the liquefied gas and the packing. The pressure resulting from the
vaporization of the liquid keeps any more liquid from passing into the
bonnet area. (The small amount of vaporized liquid is not sufficient to
produce high pres sures at shutdown).
Unpacking
1. Before installation, check the packing list against the materials
received. Lists describing the valve and accessories are included
with each valve.
2. When lifting valve from shipping container, position lifting straps to
avoid damage to tubing and mounted accessories. Most valves
may be lifted by the actuator lifting ring. If one is not provided, use
lifting straps around yoke legs to lift valve.
3. In the event of shipping damage, contact your shipper imme diately.
4. Should any problem arise, contact your Flowserve Control Products
representative.
2
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- Disassembling the Actuator
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