Lowflow Mark 708 Fractional Flow Control Valve for Ultra-Low Cv
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Lowflow's Mark 708 offers accurate fractional flow control with Cv ranges from 0.00001 to 4.0 available in 1/4" to 3/4" line sizes.
Lowflow's Mark 708 was developed to provide the most accurate control available for fractional flow services for pilot plant installations, test stands, R & D facilities or for specialized processes such as dosing, injection and venting applications. The Mark 708's rolling diaphragm design ensures that the effective diaphragm area remains relatively constant, regardless of valve stem position. A bolted body/bonnet connection simplifies maintenance — remove and replace the trim to change flow rates without removing the valve body from the process line.
- For steam, air, gas, oil, water, and chemical service
- Cv ranges from 0.00001 to 4.0 available in 1/4" to 3/4" line sizes
- Carbon steel or stainless steel body and bonnet, 14M rolling Nylon diaphragm, spring-loaded TEF/Chevron stem packing (good to 450° F)
- Extended orifice, plug guiding standard for improved shutoff and accuracy
Model Selection Guide
Make one selection from each section of the chart. A finished model number will look like this: 708SP025CS/PTT6ALA4T4S4A7
| Description | Catalog Number | |||||
|---|---|---|---|---|---|---|
| Fractional Flow Control Valve with Side Mount HART Positioner, Threaded Ends, 316SS Trim and Teflon Packing, Nylon/Nitrile Diaphragm, and Air Regulator for 14M Actuator |
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| Dimensions (Inches) | A | B | C | D | ||
| Size and Body Material (For Temps >800°F, Use SST) |
1/4" Carbon Steel 1/4" Stainless Steel 1/2" Carbon Steel 1/2" Stainless Steel 3/4" Carbon Steel 3/4" Stainless Steel |
7.25 7.25 7.25 7.25 7.25 7.25 |
11.6 11.6 11.7 11.7 13.5 13.5 |
0.9 0.9 1.2 1.2 1.2 1.2 |
6.3 6.3 6.3 6.3 9.5 9.5 |
708SP025CS/PTT6 708SP025S6/PTT6 708SP50CS/PTT6 708SP050S6/PTT6 708SP075CS/PTT6 708SP075S6/PTT6 |
| Plug Seat | Standard: Linear Hard Standard: =% Hard |
A B |
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| Max Allowable DP Rating | A-T-O w/Pos @40 PSI |
A-T-C 3-15 @20 PSI |
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| Flow Coefficient CV |
0.00001 0.00002 0.00005 0.0001 0.0002 0.0005 0.001 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 3.0 4.0 |
5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 2350 800 666 532 |
5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 2065 650 541 432 |
A B C D E F G H I J K L M N P Q R T S |
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| Range and Action | 3-15 Direct 3-15 Reverse |
A4T4S4 B4T4S4 |
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| Regulator | None Air Regulator for 14M Actuator |
0 A7 |
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| Action | Air-to-Close Air-to-Close |
D0G R0G |
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| Control Valve Type | Fractional Flow |
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