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Design Standards
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DESIGN FEATURE
Stem Sealing Design
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JMC®
floating ball valves are designed to prevent leakage from the stem area
due to a double sealing stem systemwith two gland packing and graphite.
JMC® Class 600floating ball valves have 0-rings with the double
sealingstem design of graphite and carbon fiber seals to providetight
sealing in high pressure and temperature, Thepacking is externallt
adjustable so that even with anactuator attached it can be easily
tightened.
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ISO5211 Actuator Mounting
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Machined
top mounting pad provides precise mounting of actuator or gear box,
Exact alignment allows reducing torque requirements and prevents
out-of-line wear Actuators can be supplied directly from SAMJIN JMC
onrequest.
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Blowout-Proof stem and Metal-To-Metalseal
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A
stem has a shoulder as an integral part of stem, Due to such a specific
structure the stem is not forced out evenwhen abnormal pressure is
generated or the bolts becomeloose. When the stem packing burns out due
to a fire, thestem is pressed against the body and prevent leakage
toatmosphere.
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Doublesealing Design and Metal-To-Met31seal
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JMC㉧ Floating
bali valves are constructed to have a metal contact and double sealing
design with PTFE and graphitegasket, The sealing effect can be
maintained even whenthe graphite burns out. The seats have a groove at
theprofile back for superior sealing, which can provideexcellent
sealing.
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Secondary Metal Seat
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In
the event the primary soft seal is destroyed in a fire, JMC㉧ Floating
bali valves effectively form the secondarymetal seat, which prevents
leakage and the fire spreading.
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Metal-To-MetalSeal
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JMC
㉧ floating ball valves are designed to have the dual sealing design with
gasket and metal-to-metal contact atthe connection of body and body
cap, which preventpossible leakage from temperature changes or line
stress.The sealing is maintained even when the gasket isdestroyed in a
fire. JMC㉧ Floating ball valves comply andare certified to API 607/6FA.
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Anti-Static Design
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Ball-spring devices are retained to allow the ststic charges to be led to the piping, which prevents static spark.
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PART LIST AND STANDARD MATERIAL SPEC
Standard Material Specifications
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