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Feeler Gauge
(0.010 inch)(0.25 mm)
Valve Rotor
(Customer Supplied)
Index Pin
Valve Stop
Valve Stop
General Purpose Valves (GPVs)
The standard general purpose valves have 1/16 inch zero dead volume fittings and their internal port diame-
ter is 0.016 inch. They may be classified by the number of ports they contain and their useful temperature
range. The valves with Teflon rotors may be used in the range 0 to 175 degrees C whereas the valves with
polyimide rotors function best in the range of 100 to 350 degrees C. Because of the difference in the opera-
tion temperature ranges, do not mix these two valve types in the same system. HP offers only the 6 & 10 port
GSV' s and the 4 port LSV.
1/16 inch Teflon rotor valves: 0 to 175 degrees C
1/16 inch polyimide rotor valves: 100 to 350 degrees C
Adjustable restrictor valves: ambient to 225 degrees C
Liquid Sample Valves: (see Liquid Sample Valves, this section)
The HP 5890 Series II was designed to accept valves heated in their own compartments because valves
operate best at a constant temperature. It is important to realize that when a valve is inside a gas chromato-
graph oven during a temperature programmed run, the valve temperature can lag behind the programmed
oven temperature by as much as 20 degrees C, depending on the rate employed. The mass of the pro-
grammed valve is responsible for this lag.
SVC 7- 4
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