Chromatographie

Multipositionsventile von VICI Valco

Einführung und Beschreibungen

Valco Multiposition Valves
Instead of the back and forth switching of two position valves, multiposition valves step incrementally through continuous revolutions (bi-directionally with the microelectric actuator). While we can supply older models, all the valves in this catalog have a preload assembly. This design allows the rotor to be inspected or replaced without taking the valve off the actuator, and valves ordered with a microelectric actuator are permanently aligned.

Flowpath Configurations

SD (dead-ended) valves select one of 4 to 16 dead-ended streams, directing it through the valve outlet to a sample valve, pressure sensor, detector, column, etc. Thesame configuration can also direct one stream to a number of outlets for fraction collection.

SC (common outlet) valves are similarto SDs, exceptthat instead of being dead-ended the non-selected streams flow to a common outlet.

SF (flow-through) valves are similar to SDs and SCs, selecting a stream and sending it to the outlet. However, SFs allow the non-selected streams to flow through individual outlets instead of a common outlet.

ST (trapping) valves are used for multi-column, multi-sample, or multitrap operations.

STF (trapping/flow-through) valves are similar to STs,with the single difference that the non-selected streams are returned to t heir own vents or sources rather that being dead-ended or trapped as they are in the standard ST configuration.

PORT DIAMETERS LOW PRESSURE (MW) PORT DIAMETERSHIGH PRESSURE (UW)
Fitting size No. of Positions Standard port diameter Fitting size No. of Positions Standard port diameter
SD SD
1/16" 4 - 16 0,75 mm ( 0,030" ) 1/16" 4 - 12 0,40 mm ( 0,16" )
1/8" 4 - 16 1,0 mm ( 0,040" ) 1/8" 4, 6, 8 0,75 mm ( 0,030" )
1/4" 4 - 10 4,0 mm ( 0,156" ) ST
SC 1/16" 4, 6 0,40 mm ( 0,16" )
1/16" 4 - 16 1,0 mm ( 0,040" )      
1/8" 4 - 16 1,0 mm ( 0,040" )      
1/4" 4 - 8 4,0 mm ( 0,156" )      
SF      
1/16" 4 - 16 1,0 mm ( 0,040" )      
1/8" 4 - 16 1,0 mm ( 0,040" )      
1/4" 4 - 8 4,0 mm ( 0,156" )      
ST      
1/16" 4 - 16 0,75 mm ( 0,030" )      
1/8" 4 - 16 1,0 mm ( 0,040" )      
STF      
1/16" 4 - 16 0,75 mm ( 0,030" )      
1/8" 4 - 16 1,0 mm ( 0,040" )      

Spezifikationen

Low Pressure Multiposition Valves

Valco MW Type low pressure valves are available with 1/16",1 /8" or 1/4" fittings. (Refer to the chart opposite for port diameters.) The 1/16" and 1/8" valves can be ordered with 4, 6, 8, 10, 12, or 16 positions, in any of the five flowpath configurations. Valves with 1/4" fittings are available in SD, SC, and SF flowpaths: SDs have 4, 6, 8, or 10 positions; SCs and SFs have 4, 6, or 8.
Although not shown in this catalog, MW valves are also available in a higher temperature version. While actual specifications vary with the configuration, typical specifications are 200 psi and 330°C. Consult ourtechnical staff for more information.

VALCO MULTIPOSITION VALVES - LOW PRESSURE (MW)
Fittings size Number of
positions		 Standard rotor material   Max pressure Max temp. Max pressure Max temp. Max pressure Max temp.
      SD Dead-end flowpath SC Common outlet flowpath Note: All low pressure 1/16" and 1/8" valves are also available in versions up to 330°C.
1/16" 4 - 16 Valcon E 400 psi gas 200°C 200 psi gas 200°C
1/8" 4 - 8 Valcon E 400 psi gas 200°C 200 psi gas 200°C
  10 - 16 Valcon E 200 psi gas 200°C 200 psi gas 200°C
1/4" 4 - 8 Valcon E2 100 psi gas 75°C 100 psi gas 75°C
      SF Flow-through flowpath ST Trapping flowpath STF Trapping/Flow-through flowpath
1/16" 4 - 16 Valcon E 200 psi gas 200°C 200 psi gas 200°C 200 psi gas 200°C
1/8" 4 - 16 Valcon E 200 psi gas 200°C 200 psi gas 200°C 200 psi gas 200°C
1/4" 4 - 8 Valcon E2 100 psi gas 75°C        

High Pressure Multiposition Valves

Valco UW Type high pressure valves are available in SD and ST flowpaths. SD valves with 1/16" fittings are available in 4, 6, 8, 10 or 12 positions, while 1/8" valves can be ordered with 4, 6, 8 or 10 positions. ST flowpath UW valves have 1/16" fittings, with either 4 or 6 positions. ( Refer to the chart opposite for port diameters.)

VALCO MULTIPOSITION VALVES - HIGH PRESSURE (UW)
Fittings size Number of
positions		 Standard rotor material   Max pressure Max temp. Max pressure Max temp.
      SD Dead-end flowpath ST Trapping flowpath
1/16" 4 - 12 Valcon E 5000 psi liq 75°C 5000 psi liq 75°C
1/8" 4 - 8 Valcon E 5000 psi liq 75°C    

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Low Pressure Multiposition Valves

High Pressure Multiposition Valves