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
Back Pressure Valve / Relief Valve Type DHV-S-DL, 0-10 bar Adjustable
Adjustable back pressure valve for mounting in the metering line
- To generate constant back pressure
- For accurate metering with a free outlet
- 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 the back pressure valve / relief valve type DHV-U for use with 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!
| Type | Adjustable pressure | Connection | Material | Order no. |
|---|---|---|---|---|
| DIN / ANSI | ||||
| DHV-S-DL | 0 – 10 bar | 6 to 12 mm | PP | 302323 |
| DHV-S-DL | 0 – 10 bar | 6 to 12 mm | PC/FKM* | 302324 |
| DHV-S-DL | 0 – 10 bar | 6 to 12 mm | TT | 302325 |
| DHV-S-DL | 0 – 10 bar | 6 mm | SS | 302326 |
| DHV-S-DL | 0 – 10 bar | 8 mm | SS | 302327 |
| DHV-S-DL | 0 – 10 bar | 12 mm | SS | 302328 |
| Order 2 connecting kits in the required hose size separately for the connection. |
* Please note: The product contains connections bonded with Tangit. Always note the durability of Tangit adhesive.
Back Pressure Valve Type DHV-S-DK, 0-10 bar Adjustable
Adjustable back pressure valve for mounting directly on the dosing head
- To generate constant back pressure
- For accurate metering with a free outlet
- 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!
| Type | Adjustable pressure | Connection | Material | Order no. |
|---|---|---|---|---|
| DIN / ANSI | ||||
| DHV-S-DK | 0 – 10 bar | 6 to 12 mm | PP/EPDM | 302320 |
| DHV-S-DK | 0 – 10 bar | 6 to 12 mm | PC/FKM* | 302321 |
| DHV-S-DK | 0 – 10 bar | 6 to 12 mm | TT/PTFE | 302322 |
| DHV-S-DK | 0 – 10 bar | 6 mm | SS | 1003793 |
| DHV-S-DK | 0 – 10 bar | 8 mm | SS | 1003795 |
| DHV-S-DK | 0 – 10 bar | 12 mm | SS | 1003797 |
* Caution: The product contains adhesive joints with Tangit. Please note the resistance of Tangit adhesive.
Multifunctional Valve Type MFV-DK, PVDF
Back pressure valve / relief valve for fitting directly on the pump's dosing head with the functions:
- Back pressure valve, opening pressure approx. 1.5 bar with free outlet or priming pressure at the suction end (black rotary dial)
- Relief valve, opening pressure approx. 6, 10 or 16 bar (red rotary dial)
- Priming aid for pending back pressure, no need to release discharge line
- Discharge line relief, e.g. prior to service work
The multifunctional valve is operated by free-moving rotary dials that automatically return to their original position when released by the operator. This means operation is possible even when access is difficult. The multifunctional valve is made of PVDF and can be used to meter almost any chemical.
Caution: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!
Caution: The bypass line should always be connected.
Multifunctional valve for assembly directly onto the liquid end of the pump with the following functions:
- Back pressure valve, opening pressure approx. 1.5 bar, with open discharge or positive pressure on the suction side (black rotary knob)
- Relief valve, opening pressure approx. 6, 10 or 16 bar (red rotary knob)
- Priming aid with back pressure, no need to de-pressurise pipes
- Pressure relief, e.g. prior to servicing
The ProMinent® multifunctional valve is simple to operate using smooth action rotary knobs, which return to their initial position on release. This ensures safe operation even under difficult access conditions. The ProMinent® multifunctional valve is made of PVDF and can be used with virtually all chemicals.
Warning: Back pressure valves are not intended as completely sealed units!
Caution: The bypass line must always be connected.
| Valve body | PVDF |
| Diaphragm | PTFE- coated |
| Seal | FKM and EPDM (enclosed) |
| Type | Relief opening pressure* | Connection | Bypass connector | Order no. |
|---|---|---|---|---|
| Size I | 16 bar | 6-12 | 6 x 4 | 792011 |
| Size I | 10 bar | 6-12 | 6 x 4 | 791715 |
| Size I | 6 bar | 6-12 | 6 x 4 | 1005745 |
| Size II | 10 bar | 6-12 | 12 x 9 | 792203 |
| Size II | 6 bar | 6-12 | 12 x 9 | 740427 |
| Size III | 10 bar | DN 10 | 12 x 9 | 792215 |
| * | The relief opening pressure given above is the pressure at which the valve begins to open. The pressure can be up to 50% higher until the valve is fully open depending on the type of pump. |
Application: multifunctional valves
| Size I | ALPc 1001, 1002, 1004, 1008, 0708 |
| Beta®, type 1000, 1601, 1602, 1604, 1605, 1005, 1008, 0708, 0413, 0220 | |
| gamma/ X type 1602, 1604, 1009, 0708, 0414, 0220 | |
| gamma/ XL type 1608, 1612 | |
| Size II | ALPc 0417, 0230 |
| Beta®, type 1605, 1008, 0713, 0420, 0232 | |
| gamma/ X type 1009, 0715, 0424, 0245 | |
| gamma/XL type 1020, 0730 | |
| Size III | gamma/ XL type 0450, 0280 |
For material version PP, PV, NP, TT
PVC Right-Angled Threaded Connector
Right-angled threaded connector made of PVC for mounting a multifunctional valve on metering pumps with a self-bleeding dosing head.
To fit metering pumps with self-bleeding dosing head of the Beta® and gamma/ L product ranges.
| Material | Fig. | Order no. | |
|---|---|---|---|
| PCE Version | PVC/EPDM | pk_1_083 | 1003472 |
| PCB Version | PVC/FKM | pk_1_083 | 1003318 |
* Caution: The product contains adhesive joints with Tangit. Please note the resistance of Tangit adhesive.
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.
Your benefits
- Protects against overpressure
- Priming aid
- Relieves the discharge line
- Increases dosing precision
Technical Data
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