Design The mini diaphragm valve consists of plungers and ports arranged in a circular pattern, with the plungers controlled by the reciprocation action of two air actuated pistons. Maintenance procedures are greatly simplified, since a single screw holds the valve together and locating pins insure proper alignment. Extremely long lifetime, very short actuation time (10 milliseconds), minimum internal dead volume, and reliability have made this type of valve very successful in process gas chromatography for both sample injection and column switching. |
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Only 35 mm
(1.375") in diameter >1,000,000 cycle lifetime Three configurations-6 port, 10 port, and 4 port internal sample Built in actuator 1/16" or 1/32" Valco zero dead volume fittings |
TECH TIP For optimal zero dead volume connections, make sure your tubing meets the best industry standards. OD tolerance should be nominal dimension +.002". |
Dimensions | Valve diameter is 35 mm (1.375"), height is 42 mm (1.625"), and weight is less than 255 g (9 oz). |
Valve Fittings | The valve cap has Valco 1/32" or 1/16" ZDV fitting details - a rugged design which allows easy replacement of tubing or of the valve itself. Standard bore size is 0.40 mm (.016" ). Optional bore sizes are 0.25 mm (.010") and 0.75 mm (.030"). |
Lifetime | Diaphragm valve lifetime can exceed 1,000,000 cycles at ambient temperature or 500,000 cycles at 200°C. |
Temperature/Pressure Specifications | The standard valve can be operated at temperatures up to 200°C, at 300 psi. The specially-formed diaphragm also permits sampling at subambient pressures. |
Materials of Construction | The cap is Nitronic 60 stainless (optional Hastelloy C or Type 316 stainless), with remaining metal parts of 300 series stainless. The diaphragm is formed from a specialized polyimide. |
Actuation | Actuator air (50-60 psi) is supplied to a side port with 10-32 female threads, permitting use of a variety of compression or barbed fittings. A 3-way solenoid is required for actuation. |
Spezifikationen
Internal sample: 750 psi liq 50°C max Sampling/switching: 300 psi liq 200°C max Nitronic 60 valve body Polyimide diaphragm |
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Artikelnummer | Artikelnummer | Artikelnummer | Artikelnummer | ||||
DV12-1114-.5 | DV12-1114-1 | DV12-1116 | DV12-1110 |
Spezifikationen
Internal sample: 750 psi liq 50°C max Sampling/switching: 300 psi liq 200°C max Nitronic 60 valve body Polyimide diaphragm |
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Artikelnummer | Artikelnummer | Artikelnummer | Artikelnummer | ||||
DV22-2114-.5 | DV22-2114-1 | DV22-2116 | DV22-2110 |
Spezifikationen
Internal sample: 750 psi liq 50°C max Sampling/switching: 300 psi liq 200°C max Nitronic 60 valve body Polyimide diaphragm |
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Artikelnummer | Artikelnummer | Artikelnummer | Artikelnummer | ||||
DV22-3114-.5 | DV22-3114-1 | DV22-3116 | DV22-3110 |
Beschreibung | Artikelnummer | |
Polyimide diaphragm | ||
for.010" or.016" | DV22-21 D | |
for .030" | DV22-31 D | |
PTFE diaphragm | ||
DV22-22D |
1/16" Stainless
steel loops for DV valves
Each stainless steel
loop includes: two stainless nuts and two stainless ferrules. Order special fittings separately. For 1/32" Loops use NW loops |
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Volume | Artikelnummer | Volume | Artikelnummer | ||
2 µl | CSL2 | 250 µl | CSL250 | ||
5 µl | CSL5 | 500 µl | CSL500 | ||
10 µl | CSL10 | 1 ml | CSL1K | ||
20 µl | CSL20 | 2 ml | CSL2K | ||
50 µl | CSL50 | 5 ml | CSL5K | ||
100 µl | CSL100 | 10 ml | CSL10K |
The internal sample (fixed volume) flowpath is used when very small sample volumes are required.The sample size is determined by a passage engraved on the valve cap, allowing precise, repeatable injections. In Position A, the sample flows through the sample passage while the carrier flows through to the column. In Position B, the sample passage is in line with the column and the carrier injects the contents of the sample passage into the column. |
With the valve in Position A, sample flows through the external loop while the carrier flows directly through to the column. When the valve is switched to Position B, the sample contained in the sample loop and valve flow passage is injected into the column. |
When components of interest are low boiling, this plumbing scheme allows "heavy" components with long retention times to be backflushed to waste. After the sample loop is loaded in Position A, the valve is switched to Position B to inject the sample into column 1. As soon as all components of interest have entered column 2, the valve is switched back to Position A. Column 1 is backflushed to vent during the analysis, reducing the total analysis time. |