Siemens Liquid Injection Valve Specifications; Table 4-5 Configuration - Siemens Maxum II PD PA AP Service Manual

Valves and oven components

Table of Contents

Valves

4.2 Liquid Injection Valve

Procedure

1. Check the spring travel and correct using the adjustment assembly (13) if necessary. The

spring travel is correctly set if the flange (17) can be rotated a further 2.5 rotations starting

with the first pressing of the Belleville washer plate springs until the flange rests on the

valve body. The plate springs can be viewed through a hole when pressing together. If the

flange is tightened firmly, there should be a gap of 0.3 to 0.5 mm between the plate springs.

2. If the adjustment is necessary, loosen the flange from the valve body again, and screw the

nut and counternut in or out as necessary. Then repeat the preceding step.

3. This step is only necessary if using the less common cross-hole stem and should only be

executed if the entire valve including the vaporizer is removed from the analyzer.

Rotate the vaporizer (16) using a 6mm wrench until the carrier gas inlet (18) is parallel to

the sample flow unit (15). The carrier gas should flow through the hole in the stem when

injecting.

Installing the SLIV in the Analyzer

1. If the entire valve was completely removed from the analyzer (including the flange and

vaporizer), reinstall it at this time, but do not connect control lines, sample lines, or carrier

gas.

When installing the valve, adjust the valve body (7) so that sample will flow vertically through

the valve. This is necessary to prevent bubbles from forming in the valve.

2. Position the control cylinder (1), and tighten the two hex set screws (2) on the side. The

screws must firmly grip the groove in the valve body (5) wall. See the

Body illustration.

3. Connect the control lines.

4. Activate the actuator pneumatically. Check that you can hear the switching and movement

noises.

5. Connect the sample lines. After connecting the sample lines inspect that they are not

subjected to any strain and that sample will flow through the valve vertically (to prevent

bubbles from collecting in the valve).

6. Complete re-installation of valve into analyzer including reconnection of carrier gas and

column tubing (if these were disconnected during removal).

Replacing the Dosing Stem

Although it is possible to replace the control piston (3) and stem (6) without disassembling the

valve body (7), Siemens recommends that the valve body be disassembled and serviced

whenever the stem is replaced.

4.2.5