QED 40771 Precision Fine Tune Control Valve Instructions
- June 8, 2024
- QED
Table of Contents
40771 Precision Fine Tune Control Valve
Instructions
Precision Fine Tune Control Valve (2 in.) Instructions
he QED Precision Fine Tube Control Valve is a metered rising stem, angle globe valve. The Valve has been designed to allow fine tuning of the gas flow from landfill gas collection wells, especially at very low gas flow rates. The rising stem valve exposes more of the metered scale as it is opened, allowing the customer to see and record, numerically, exactly how far open the valve is.
Installation:
The valve will work in any orientation, regardless of which pipe port is connected to the intake gas.
Operation:
Turn the valve handle counterclockwise to open. As the valve is opened, the yellow metered label will expose, indicating the relative position of the valve. The chart below shows the approximate gas flow rate (at 40 in. water column vacuum) that can be expected for a given number of turns of the valve from the closed position.
Specifications:
Recommended Pressure: 5 psi.
Maximum Temperature: 200 °F (93.3 °C)
Flow at 40 in. wc vacuum: 200 scfm
Materials: 304 SS, Glass-filled polypropylene, Viton 
Reinforced Nylon Orifice Plates
40770 – 2 Inch Orifice Plate Kit:
| Model | Hole Size | **Optimal Flow Range*** | Color |
|---|---|---|---|
| 40771 | 0.40 (1.01 cm) | 1 – 5 scfm | White |
| 40772 | 0.50 (1.27 cm) | 2.5 – 8 scfm | Red |
| 40773 | 0.75 (1.90 cm) | 6 – 19 scfm | Yellow |
| 40774 | 1.00 (2.54 cm) | 11 – 34 scfm | Green |
| 40775 | 1.25 (3.18 cm) | 18 – 56 scfm | Blue |
| 40776 | 1.40 (3.56 cm) | 24 – 75+ scfm | Grey |
QED’s Quick-Change Orifice Plates are constructed of 1/16” SS or Fiber
reinforced nylon. With several sizes of orifice plates available, it is easy
to select the right plate for the appropriate pressure drop allowing for
accurate flow measurements.
Stainless Steel Orifice Plates for Vertical Wellheads
40747 – 1.25 Inch Orifice Plate Kit:
| 40745 | Hole Size | Optimal Flow Range* |
|---|---|---|
| Model | 0.26 (0.66 cm) | 0 – 2.5 scfm |
| 40642 | 0.50 (1.27 cm) | 2.5 – 8 scfm |
| 40643 | 0.75 (1.90 cm) | 6 – 20 scfm |
| 40746 | 0.95 (2.41 cm) | 12 – 36+ scfm |
40640 – 2 Inch Orifice Plate Kit:
| 40641 | Hole Size | Optimal Flow Range* |
|---|---|---|
| Model | 0.40 (1.01 cm) | 1 – 5 scfm |
| 40642 | 0.50 (1.27 cm) | 2.5 – 8 scfm |
| 40643 | 0.75 (1.90 cm) | 6 – 19 scfm |
| 40644 | 1.00 (2.54 cm) | 11 – 34 scfm |
| 40645 | 1.25 (3.18 cm) | 18 – 56 scfm |
| 40646 | 1.40 (3.56 cm) | 24 – 75+ scfm |
40660 – 3 Inch Orifice Plate Kit
| 40664 | Hole Size | Optimal Flow Range* |
|---|---|---|
| Model | 1.25 (3.18 cm) | 16 – 52 scfm |
| 40666 | 1.75 (4.45 cm) | 34 – 107 scfm |
| 40668 | 2.10 (5.33 cm) | 54 – 170+ scfm |
Available Vacuum (System) Port
*For best practice and most efficient operation, use the next smaller orifice plate when the pressure differential is less than 0.5 inches of water column; Use the next larger orifice plate when the pressure differential is greater than 5 inches of water column.
The included S-Biner® Stainless Steel Dual Carabiner is designed and engineered by Nite Ize, Inc. in Boulder, CO USA. MANUFACTURED IN CHINA. Patent and Trademark Information at Niteize.com/IP. The distinctive shapes, styles, configuration and overall appearance of all Nite Ize products are trademarks of Nite Ize, Inc.
QED Environmental Systems Inc.
2355 Bishop Circle West Dexter, MI 48130,USA
WWW.QEDENV.COM
800.624.2026 %7 734.995.2547
PN: 95290 Rev 01