Back Pressure Valves/Relief Valves for Low-Pressure Metering Pumps
Back pressure valves are used to generate a constant back pressure and achieve precise metering in systems with a free outlet. They are also used in conjunction with pulsation dampers to generate low-pulsation metering.
Product description
Multifunctional Valve Type MFV-DK, PVDF
Pressure maintenance/relief valve for mounting directly on the dosing head of the pump with the following functions:
- Back pressure valve, opening pressure approx. 1.5 bar, with free drain or priming pressure on the suction side (black rotary dial)
- Relief valve, opening pressure approx. 6, 10 or 16 bar (red rotary dial)
- Priming aid when back pressure is present, no need to loosen the pressure line
- Relieves the pressure line, e.g. before service work
The multi-function valve is operated via smooth-running rotary dials that automatically return to their original position when released. This guarantees safe operation even when access is difficult. The multi-function valve is designed in PVDF materials and can be used for dosing many chemicals.
Attention: Back pressure valves are not absolutely tight shut-off devices! The installation instructions in the operating instructions must be observed!
Caution: The bypass line must always be connected.
| Valve body | PVDF |
| Diaphragm | PTFE-coated |
| Seal | FKM and EPDM (loose) |
Type | Relief opening pressure* | Connector size | Bypass connector | Dim. B | Dim. H | Order no. |
|---|---|---|---|---|---|---|
mm | mm | |||||
* The relief opening pressure given above is the pressure at which the valve starts to open. The pressure may be up to 50% more than this before the valve is fully open depending on the type of pump. | ||||||
Size I | 16 bar | 6-12 | 6 x 4 | 118 | 89 | 792011 |
Size I | 10 bar | 6-12 | 6 x 4 | 118 | 89 | 791715 |
Size I | 6 bar | 6-12 | 6 x 4 | 118 | 89 | 1005745 |
Size II | 10 bar | 6-12 | 12 x 9 | 138 | 96 | 792203 |
Size II | 6 bar | 6-12 | 12 x 9 | 138 | 96 | 740427 |
Size III | 10 bar | DN 10 | 12 x 9 | 138 | 120 | 792215 |
| Multi-function valve application | |
|---|---|
| Size I | ALPc 1001, 1002, 1004, 1008, 0708 |
| beta/ b, type 1000, 1601, 1602, 1604, 1605, 1005, 1008, 0708, 0413, 0220 | |
| beta/ X type 16006 | |
| gamma/ X type 1602, 1604, 1009, 0708, 0414, 0220 | |
| gamma/ XL type 1608, 1612 | |
| Size II | ALPc 0417, 0230 |
| beta/ b, type 1605, 1008, 0713, 0420, 0232 | |
| beta/ X type 07018, 04028, 02050 | |
| gamma/ X type 1009, 0715, 0424, 0245 | |
| gamma/ XL type 1020, 0730 | |
| DULCOFLEX DFXa | |
| Size III | gamma/ XL type 0450, 0280 |
| Sigma 1 with DN10 |
For material version PP, PV, NP, TT
Back pressure valve type DHV-S-DK, 0-10 bar adjustable
Adjustable back pressure valve for fitting directly onto the dosing head to generate a constant back pressure. For accurate metering with a free outlet and with priming pressure on the suction side.
Please note: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!
| Applications: | Metering pump alpha, beta, gamma/ X, gamma/XL, Pneumados b, EXTRONIC |
Type | adjustable pressure max. | Connector width | Material | Order no. |
|---|---|---|---|---|
bar | DIN / ANSI | |||
DHV-S-DK | 10 | 6 to 12 mm | PP | 302320 |
DHV-S-DK | 10 | 6 to 12 mm | PC/FKM | 302321 |
DHV-S-DK | 10 | 6 to 12 mm | TT | 302322 |
DHV-S-DK | 10 | 6 mm | SS | 1003793 |
DHV-S-DK | 10 | 8 mm | SS | 1003795 |
DHV-S-DK | 10 | 12 mm | SS | 1003797 |
Caution: The product contains adhesive joints with Tangit. Please note the resistance of Tangit adhesive.
Back pressure valve/relief valve type DHV-S-DL, 0-10 bar adjustable
Adjustable back pressure valve for installation in the metering line to generate a constant back pressure for precise metering with a free outlet and with priming pressure on the suction side
When used as a back pressure valve in long lines to avoid resonance vibrations: Install at the end of the metering line or select a set pressure greater than the line pressure loss
Use in conjunction with pulsation damper only with a free outlet and short metering line. Use type DHV-U when using a pulsation damper with back pressure or long lines.
Please note: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!
| Applications: | Metering pumps alpha, beta, gamma/ X, gamma/ XL, Pneumados b, EXTRONIC |
Type | adjustable pressure max. | Connector width | Material | Order no. |
|---|---|---|---|---|
bar | DIN / ANSI | |||
DHV-S-DL | 10 | 6 to 12 mm | PP | 302323 |
DHV-S-DL | 10 | 6 to 12 mm | PC/FKM | 302324 |
DHV-S-DL | 10 | 6 to 12 mm | TT | 302325 |
DHV-S-DL | 10 | 6 mm | SS | 302326 |
DHV-S-DL | 10 | 8 mm | SS | 302327 |
DHV-S-DL | 10 | 12 mm | SS | 302328 |
2 connector kits of the required hose size should be ordered as extras for the connection.
* Please note: The product contains connections bonded with Tangit. Always note the durability of Tangit adhesive.
Pipe Nipples
For the direct connection of the pressure maintenance valve DHV-S-DL in stainless steel (SS) to the liquid end.
Type | Dim. A | Dim. B | Order no. |
|---|---|---|---|
mm | mm | ||
1.4571 pipe nipple | 6 | 40 | 818537 |
1.4571 pipe nipple | 8 | 40 | 818538 |
1.4571 pipe nipple | 12 | 40 | 818539 |
Overview
Accurately metered
Back pressure valves are designed for different applications. Please refer to the relevant notes for the different designs.
Relief valves are used in the bypass to protect pumps, pipes and fittings from overpressure in the event of incorrect operation or blockages. In the event of a malfunction, the pump pumps back into the storage tank.
The benefits for you
- Protects against overpressure
- Priming aid
- Relieves the pressure line
- Increases dosing precision