Model 20 Valve Specifications - Siemens Maxum II PD PA AP Service Manual

9. Referring to the following screw tightening rotation sequence, securely tighten the three
Allen screws (3) that connect the valve cap (1) to the valve plunger body (13). One at a
time, tighten each screw to first torque. Then continue with the next torque value until the
final value is reached.
a. Finger tighten
b. 20 inch-pounds (2.3 Nm)
c. 40 inch-pounds (4.5 Nm)
d. 60 inch-pounds (6.8 Nm)
10.Tighten the three Allen screws (16) that secure the plunger valve body (13) to the cylinder
base (14) to approximately 30 to 40 inch-pounds (3.4 to 4.5 Nm).
BE CERTAIN ALL ALLEN SCREWS ARE SECURELY TIGHTENED. DO NOT
OVERTIGHTEN.
4.4.3

Model 20 Valve Specifications

Internal loop sample size:
External loop sample size:
Sample filter:
Maximum operating temperature:
Maximum sample pressure:
Minimum sample pressure:
Maximum leak rate between ports:
Material in contact with sample:
Connection size and type:
Actuating air:
Total switching time:
Body size:
Mounting:
Other:
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
2 μl standard. (Other sizes are available on special request.)
170 μl standard. (Other sizes are available on special request.)
5 μm recommended (not furnished with valve).
122°C (250°F) standard
1380 kPa (200 psi) gage instrument air standard.
10350 kPa (1500 psi) gage with 2 80 550 kPa (80psi) gage air signals. Higher
operating pressure available on special request.
34.5 kPa (5 psig)
Less than 1 μl per minute between ports.
316 stainless steel and Teflon, standard. Other materials are available on special
request.
1.6 mm ( / ") O. D. tubing, with Swagelok® fittings
1
16
345 kPa to 550 kPa (50 to 80 psig) instrument air standard. 550 kPa (80 psig)
maximum. Helium or nitrogen may be substituted for air.
150 ms (total time from initiation of command signal to completion of change in
valve state)
70 mm (2 / ") diameter by 70 mm (2
3
4
Clamp type
A carrier purge (helium, hydrogen, or nitrogen) may be used (an external low-
pressure gas supply is required).
4.4 Model 20 Valve
/ ") height
3
4
Valves
67