Table 4-6
Siemens Liquid Injection Valve
Vaporization temperature
60 to 350°C (140 to 662°F) depending on application and temperature class
Injection volume
0.1 to 9.5 μl
Sample temperature
-20 to +150°C (-4 to 302°F)
Material in Contact with Sample
Stainless steel, mat. no. 1.4571, Hastelloy, Monel, Rulon, Teflon or special materials
Control pressure
400 to 600 kPa (58 to 87 psig)
Sample pressure
Max. 6000 kPa (870 psig), recommended 50 to 100 kPa (7.25 to 14.5 psig)
Connections for pipe
3.14 mm (
1
/
8
") outer diameter
Table 4-7
Liquid sample inlet conditions
Sample Flow
5-20 cc/min (application dependent)
Sample Filtration
0.3-5 micron (sample valve dependent)
Minimum Sample Pressure
35 kPa (5 psig), lower pressure optional
Maximum Sample Pressure
2070 kPa (300 psig) standard; higher pressure optional
Maximum Sample Temperature
121°C (250°F) standard; higher temperature optional
4.3
Model 50 Valve
The Model 50 valve is a pneumatically operated diaphragm valve that is equipped with 10
ports. It can perform the function of two Model 11 valves, although it is less than half the size
of a Model 11 valve.
The valve is turned On or Off using air pressure applied to diaphragms. This air pressure
activation eliminates the need for pistons, plungers, or any other moving parts. The valve can
both inject vapor samples and switch columns simultaneously. The Model 50 is capable of
switching gasses up to 75 psig (515 kPa). Actuation air for the Model 50 can be either carrier
gas or other bottled inert gas. Consumption of gas for actuation is negligible.
One primary distinction that separates the Model 50 from the Model 20 and Model 11 valves
is the port switching. When the valve is On, flows between the following ports are open: ports
1 & 10, ports 2 & 3, ports 4 & 5, and ports 8 & 9. When the valve is Off, flows between the
following ports are open: ports 1 & 2, ports 3 & 4, ports 5 & 6, ports 7 & 8, and ports 9 & 10.
Note that when the valve is On, flow between ports 6 & 7 is not active as might be expected
(see figure below). This patented feature is unique to the Model 50 and allows elimination of
external hardware that would be required otherwise.
The Model 50 is designed such that the pressure is required to turn the valve either On or Off.
Actuation ports are located on the side of the valve between ports 1 and 10. The Off actuation
port is labeled "0" and the On actuation port is labeled "1". When pressure is applied to the Off
actuation port, the valve is set to Off. When pressure is applied to the On actuation port, the
valve is set to On. When no pressure is applied to either actuation port, ALL ten valve ports
are interconnected.
Valves
4.3 Model 50 Valve
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
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