Isolation valves, Bellowless poppet valves & leak valves, Replacement o-ring & valve rebuild kits – Nor-Cal Metal Valve User Manual
Page 2: Leak valves, Pneumatic bellowless angle valves
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.