Nor-Cal Metal Valve - Manual (Page 3)

3
Isolation Valves
Ultra-High Vacuum Components Since 1962 • www.n-c.com
3
SECTION 3.11
C
Indicator collar
with set screw
Closure nut
321 stainless steel bellows
Copper poppet seal
B
A
A
S.S. knife
edge seal
Bakeable All Metal Valves
MODEL
NUMBER
NOMINAL
PORT OD
FLANGE
TYPE
CONDUCTANCE (L/sec )
MOLECULAR VISCOUS A
(OPEN)
B C
AMV-0752-CF 3 /
4
(19) Rotatable 1.33 CF 3 56 1.50 (38) 5.40 (137) 1.50 (38)
AMV-1502-CF 1 1 /
2
(38) Rotatable 2.75 CF 10 356 2.45 (62) 6.87 (175) 1.50 (38)
NOTE: Port lengths that match other manufacturers’ products are available upon request.
Replacement Seals
MODEL
NUMBER
NOMINAL
PORT OD
AMV-075-95 0.75 (19)
AMV-150-95 1.50 (38)
Nor-Cal’s metal seal angle valves are
intended for use in UHV or cryogenic
applications where temperature extremes
preclude the use of our elastomer seal
valves. Approved for use in beamline
facilities, these valves have a temperature
operating range from -250°C to 400°C.
Heater jackets and controllers are
available on request.
The pulled-port method is used for
the fabrication of the stainless steel
bodies resulting in higher conductance
and better cleanliness. Heater jackets
and controllers are available on request.
The life of the copper poppet seal is
dependent upon the temperature at
which the valve is used. Maximum
temperature bakeouts may require copper
poppet seal replacement after 50 cycles,
while hundreds of cycles are possible
with moderate bakeouts. As many as
10,000 cycles have been obtained
from the same seal during testing.
A dial indicator at the top of the valve
indicates the proper torque for closure
and also when the seal should be replaced.
The copper poppet seal is easily replaced
by opening the valve with a slotted screw
driver. The seal is removed through the
side port and a new one replaced in a
like manner. After seal replacement the
valve must be torqued to a higher value
than during normal operation to make it
seat. Do not exceed the maximum torque
Torque Specifications
MODEL
NUMBER
SEATING
Nm
NORMAL
Nm
MAXIMUM
Nm
AMV-075-CF 6.8 5.6 13.6
AMV-150-CF 13.6 11.3 22.6
specifications. (See torque specifica-
tions table.) After closing the valve to its
normal torque value loosen the set screw
below the closure nut, rotate the indica-
tor to the furthest counter-clockwise line
on top of the valve and retighten the set screw. The valve may be closed to this
mark indefinitely. Periodic checks with a
torque wrench will indicate seat wear
and the proper mark to use for alignment.
When the indicator has reached the last
mark we recommend seal replacement.
SPECIFICATIONS
Port ODs: 3 /
4
and 1 1 /
2
inch (19 to 38mm)
Finish: Electropolished
Assembly: Clean room
Materials
Pulled port body: 304 stainless steel
Bellows: Formed 321 stainless steel
Poppet seal: OFHC Copper
Actuation: Manual using self-lubricating
bronze nuts with ACME threads
Operating temperature: -250ºC to 400ºC
Maximum bakeout temperature
Open: 400°C
Closed: 300°C
Vacuum rated: >1x 10
-10 mbar - UHV
Helium leak rate: <10 -10 mbar l/sec.
Options: Heater jackets and controllers
All dimensions are in inches (mm) & weights
are in pounds (kg), unless otherwise noted.