Nor-Cal Metal Valve - Manual (Page 2)

3
Isolation Valves
Ultra-High Vacuum Components Since 1962 • www.n-c.com
2
SECTION 3.9
Bellowless Poppet Valves & Leak Valves
A
A
C
B
D
SPECIFICATIONS
Nominal Port ODs: 3 / 8 to 1 1 / 2 inches
(10 to 38mm)
Materials
Body: Electropolished 304 stainless steel
Bonnet seal: Viton
Poppet seal: Viton
Other O-ring compounds available
Actuation: Normally closed
3 / 8 to 1 1 / 2 inch (10 to 38mm) ODs: Air-to-open,
spring-to-close
See page 101 for actuation options
Operating pressure: 60 to 80 psig (4-5.5 bar)
Differential pressure
Port side: Maximum 100 psig (7 bar)
Poppet: Maximum 6psi (0.4 bar)
differential across the valve seat.
Maximum temperature with Viton seals
Sustained: <150°C
Intermittent: <204°C
Vacuum range: >1x 10
-9 mbar - High Vacuum
Options: Fittings, O-rings, air solenoids,
micro-switches and actuators. See page 101
Replacement O-Ring & Valve Rebuild Kits
MODEL
NUMBER
NOMINAL
PORT OD DESCRIPTION
ESVP-075-95-5 3 /
8
-1 (10-25) O-ring kit
ESVP-150-95-5 1 1 / 2 (38) O-ring kit
ESVP-075-99-5 3 /
8
-1 (10-25)
Complete rebuild kit, includes all valve parts except
valve body
ESVP-150-99-5 1 1 / 2 (38)
Complete rebuild kit, includes all valve parts except
valve body
Nonrotatable
Rotatable
1.190
(30.23)
1.717
(43.61)
1.298
(32.97)
4.350
(110.49)
1.750
(44.45)
SPECIFICATIONS
Materials
Body: Electropolished 304 stainless steel
Flanges
Inlet: 1.33 CF, rotatable,
clearance bolt holes
Outlet: 2.75 CF, nonrotatable,
clearance bolt holes
Poppet: Sapphire
Poppet seat: Copper
Actuation: Manual, adjustable set point
Maximum temperature
Sustained: <250°C
Intermittent: <450°C
Vacuum range: >1x 10
-11 mbar - UHV
Minimum leak rate
Normal: 1x10 -10 mbar l/sec.
Non-condensible gas: 1x10 -8 mbar l/sec.
Inlet gas pressure: maximum 500 psig
(34 bar)
Poppet seat life
Unbaked: 250 to 300 closures
<250ºC: 80 to 100 closures
<450ºC: 20 to 30 closures
Leak Valves
Leak valves are used for controlling gas introduction into high- and ultra-high vacuum systems. They utilize an optically flat sapphire
poppet and a metal seal seat, allowing bakeout temperatures to 450ºC. These valves are manually actuated by a cantilever arm with
precision adjustment threads. The adjustment knobs can be set to allow controlled leak rates as small as 1x10
-10 mbar l/sec .
Replacement sapphire and gasket assemblies are available. Call for pricing.
MODEL
NUMBER
LL-275-133
All dimensions are in inches (mm) & weights
are in pounds (kg), unless otherwise noted.
MODEL
NUMBER
NOMINAL
PORT OD
FLANGE
TYPE
L/SEC
(molecular) A B C D
ESVP-0382-NWB-5 3 /
8
(10) NW-10B 0.66 1.65 (41.9) 3.77 (96) 5.92 (150) 2.25 (57)
ESVP-0752-NWB-5 3 /
4
(19) NW-16B 5.00 2.15 (54.6) 4.27 (108) 6.41 (163) 2.25 (57)
ESVP-1002-NWB-5 1 (25) NW-25B 12.00 2.03 (51.6) 4.03 (102) 6.17 (157) 2.25 (57)
ESVP-1502-NWB-5 1 1 /
2
(38) NW-40B 128.00 2.40 (61.0) 5.13 (130) 7.71 (196) 3.00(76)
Pneumatic Bellowless Angle Valves
Right angle bellowless poppet valves are now available in sizes from 3 /
8
thru 1 1 /
2
inches (9.53-38.1mm). These valves are typically
used for applications with large differential pressures, extremely high cycle rates or “dirty” processes that cause frequent bellows
failures. Poppet shafts are sealed with double O-rings. Heater jackets and other port and flange configurations are available on
request.