Motor Driven Hydraulic Double Diaphragm Chemical Dosing Pump
A process pump specifically designed for hazardous and precise dosing application.
Mechanical Hydraulic Diaphragm Dosing Pump
Flowrate: 1 – 3500 l/h (Standard Product) / custom order up to 20,000 l/h for a single pump head.
Pressure: Up to 400 bar.
Common Applications: High Pressure / High Viscosity / High Temperature / Hazardous (Leak Free) / Precise Dosing
Upgrade to SMART digital piston pump
WRS latest SMART digital dosing pump technology is also implementable to our Piston & Hydraulic diaphragm dosing pump series. Instead of using the traditional Variable Speed Drive method, this allows more controls capability and high accuracy dosing, thanks the development of the Servo Motor and BLDC Motor.
To see the complete SMART digital version, please see the SMART Series Hydraulic Diaphragm Pump’s tab below.
Optional for interchangeable induction motor:
WRS pumps are designed with various configurations, offering different type of solutions to meet all of our client’s requirements. From pump head design, motor types to control variants.
Options:
- Variable Frequency Motor
- Explosion Proof Motor
- Variable Frequency + Explosion Proof Motor
(Standard on stock motor: ExdIIBT4, other options are available upon request.) - BLDC / Servo Motor (SMART Series Piston Pump)
*Note: Variable Frequency motor is not required for digital control. Digital control will paired with Servo Motor / BLDC Motor to achieve flow rate control in a much better accuracy.
Multiple Wetted-End material for all applications
To handle all types of chemicals, WRS hydraulic diaphragm dosing pump have multiple wetted-end material choice.
Default option: SS316L
Other options: SS304 / PVC / PVDF / SS lined Teflon / Hastelloy / Duplex / Super Duplex
Suction & Discharge Connection Method Options:
Able to match user’s requirements or factory’s standard connection. Either flange, threaded according to your local standards.
Optional upgrade of pump head/cooling.
Specially designed for fluid required stable operating temperature. Applicable to both Piston & Hydraulic Diaphragm Dosing Pump.
Multiple Pump Head Configuration
Optional to manufacture multiple pump heads for special application such as: high flow or mixing application. Pump can be run with single motor. Applicable to both Piston & Hydraulic Diaphragm Dosing Pump as they share the same pump body.
Hydraulic Diaphragm Pump – Diaphragm Rupture Detection
Maximize your operational safety by upgrading your WRS hydraulic diaphragm dosing pump with a state-of-the-art diaphragm rupture detection unit. Should a diaphragm failure occur, this add-on immediately transmits a warning signal to your feedback system. This gives your team the critical time needed to safely shut down and repair the pump, completely preventing the spread of dangerous chemicals.
HYDRAULIC DIAPHRAGM PUMP IDENTIFICATION CODE
Example: [ ][ ] HS [ ] 020 S 0 P 0 1 S 1 1 – XXX
- First two blank boxes: For multiple pump head use. Empty if it is only single pump head.
- Third blank box (before pump size): For digital control use. Empty if it is a manual control pump.
- Trailing “-XXX”: For any non standard / custom make use (Factory to provide). Empty if it is according to standard design as shown in this brochure.
| Example | Category | Description |
|---|---|---|
| – | Pump Head Quantity | None – Single Pump Head 2 – Twin Head 3 – Triple Head X – Custom Make *2 |
| – | Digital or Manual Control | None – Manual Control E – With Digital Control |
| HS | Pump Body | HS HM HL HD H* – Custom Make Body Size *2 |
| – | Digital Control Method | P – Plus Series L – Lite Series None – No Digital Control |
| 020 | Piston Size | 006 – 200 |
| S | Pump Head Material | S – SS316L C – SS304 D – Duplex 2205 H – Hastelloy C P – PVC F – PVDF T – PTFE S* – SS316L + Lined Material X – Custom Make *2 |
| 0 | Pump Head Heating/Cooling | 0 – None 1 – Liquid/Stem Heating/Cooling 2 – Electric Heating X – Custom Make *2 |
| P | Diaphragm Material | P – PTFE M – Metal Diaphragm X – Custom Make *2 |
| 0 | Valve Spring | 0 – No Spring 1 – Inlet Spring 2 – Outlet Spring 3 – Both Inlet & Outlet with Spring |
| 1 | Diaphragm Rupture Detection | 1 – None (Single diaphragm) 2 – Double Diaphragm with Pressure Gauge Indication 3 – Double Diaphragm with Pressure Gauge + Open Contact Switch 4 – Custom Make *2 |
| S | Connection Method | S – Bevel End Welding Tube F – Flanged (user to provide flange standard) P – Inner Thread (user to provide thread standard) X – Custom Make *2 |
| 1 | Power Required | 1 – 380V 50HZ 3Phase 2 – 220V 50Hz 1Phase X – Custom Make *2 |
| 1 | Motor Type | 0 – No Motor 1 – IEC Motor 2 – Variable Frequency Motor 3 – Explosion Proof Motor (Exd IIB T4) 4 – Variable Frequency and Explosion Proof Motor (Exd IIB T4) X – Custom Make *2 |
| XXX | Custom Make Code | For factory use only. Reserved for custom make selections. |
*Notes:
1) Identification code are for identifying the pump not for complete selection. If there are any question on selection, please contact with us or our representative.
2) All custom make selection shall make confirmation with factory.
HYDRAULIC DIAPHRAGM PUMP TECHNICAL PARAMETERS
All data are tested in an indoor environment, with clean water at ambient temperature. Pumps are connected to a 50Hz power supply.
HS
| Model | Max. Flowrate (Lph) |
Max. Back Pressure (Bar) | Piston Diameter (mm) |
SPM | Stroke Length (mm) |
Default Connection Method | |
|---|---|---|---|---|---|---|---|
| 0.25 KW | 0.37 KW | ||||||
| 006* | 1 | 300 | 400 | 6 | 96 | 20 | DN6 Bevel End Welding Tube |
| 008* | 2 | 200 | 300 | 8 | 96 | 20 | |
| 010 | 5 | 170 | 250 | 10 | 96 | 20 | |
| 010 | 8 | 120 | 180 | 10 | 144 | 20 | |
| 012 | 15 | 80 | 120 | 12 | 144 | 20 | |
| 016 | 30 | 47 | 70 | 16 | 144 | 20 | DN10 Bevel End Welding Tube |
| 020 | 55 | 27 | 40 | 20 | 144 | 20 | |
| 025 | 80 | 17 | 25 | 25 | 144 | 20 | |
| 028 | 100 | 13 | 20 | 28 | 144 | 20 | |
| 032 | 130 | 11 | 16 | 32 | 144 | 20 | |
| 035 | 160 | 8 | 12 | 35 | 144 | 20 | |
| 040 | 220 | 6 | 10 | 40 | 144 | 20 | DN15 Bevel End Welding Tube |
*Notes: Please contact with our engineers or local sales representative when choosing these models.
HM
| Model | Max. Flowrate (Lph) |
Max. Back Pressure (Bar) | Piston Diameter (mm) |
SPM | Stroke Length (mm) |
Default Connection Method | |
|---|---|---|---|---|---|---|---|
| 0.55 KW | 0.75 KW | ||||||
| 008 | 4 | 400 | 450 | 8 | 96 | 25 | DN6 PN700 Bevel End Welding Tube |
| 010 | 6 | 350 | 400 | 10 | 96 | 25 | |
| 012 | 10 | 250 | 300 | 12 | 96 | 25 | |
| 012 | 20 | 150 | 200 | 12 | 144 | 25 | |
| 016 | 36 | 90 | 120 | 16 | 144 | 25 | DN10 PN700 Bevel End Welding Tube |
| 018 | 48 | 70 | 100 | 18 | 144 | 25 | |
| 020 | 60 | 60 | 80 | 20 | 144 | 25 | |
| 025 | 100 | 35 | 50 | 25 | 144 | 25 | DN15 PN110 Bevel End Welding Tube |
| 032 | 160 | 22 | 30 | 32 | 144 | 25 | |
| 036 | 210 | 18 | 25 | 36 | 144 | 25 | |
| 040 | 260 | 15 | 20 | 40 | 144 | 25 | DN25 Flange |
| 045 | 330 | 11 | 15 | 45 | 144 | 25 | |
| 050 | 420 | 9 | 12 | 50 | 144 | 25 | |
| 055 | 500 | 7 | 10 | 55 | 144 | 25 | |
| 060 | 600 | 6 | 8 | 60 | 144 | 25 | |
| 070 | 800 | 3 | 5 | 70 | 144 | 25 | |
HL
| Model | Max. Flowrate (Lph) |
Max. Back Pressure (Bar) | Piston Diameter (mm) |
SPM | Stroke Length (mm) |
Default Connection Method | |
|---|---|---|---|---|---|---|---|
| 1.1 KW | 1.5 KW | ||||||
| 012 | 12 | 400 | 450 | 12 | 96 | 30 | DN6 Bevel End Welding Tube |
| 016 | 25 | 250 | 300 | 16 | 96 | 30 | |
| 016 | 42 | 160 | 220 | 16 | 144 | 30 | DN10 Bevel End Welding Tube |
| 018 | 58 | 130 | 180 | 18 | 144 | 30 | |
| 020 | 75 | 110 | 150 | 20 | 144 | 30 | |
| 025 | 120 | 70 | 100 | 25 | 144 | 30 | DN15 Bevel End Welding Tube |
| 032 | 200 | 40 | 60 | 32 | 144 | 30 | |
| 036 | 250 | 33 | 45 | 36 | 144 | 30 | |
| 040 | 320 | 28 | 38 | 40 | 144 | 30 | |
| 045 | 400 | 22 | 30 | 45 | 144 | 30 | DN25 Flange |
| 050 | 500 | 18 | 25 | 50 | 144 | 30 | |
| 055 | 600 | 15 | 20 | 55 | 144 | 30 | |
| 060 | 720 | 12 | 16 | 60 | 144 | 30 | |
| 065 | 820 | 10 | 14 | 65 | 144 | 30 | |
| 070 | 950 | 9 | 12 | 70 | 144 | 30 | |
| 080 | 1250 | 7 | 10 | 80 | 144 | 30 | DN40 Flange |
| 085 | 1450 | 6 | 8 | 85 | 144 | 30 | |
| 090 | 1600 | 4 | 6 | 90 | 144 | 30 | |
HD
| Model | Max. Flowrate (Lph) |
Max. Back Pressure (Bar) | Piston Diameter (mm) |
SPM | Stroke Length (mm) |
Default Connection Method | ||
|---|---|---|---|---|---|---|---|---|
| 2.2 KW | 3.0 KW | 4.0 KW | ||||||
| 012 | 30 | 400 | 500 | 700 | 12 | 144 | 50 | DN10 Bevel End Welding Tube |
| 016 | 65 | 250 | 280 | 400 | 16 | 144 | 50 | |
| 018 | 90 | 150 | 220 | 300 | 18 | 144 | 50 | |
| 020 | 125 | 130 | 180 | 250 | 20 | 144 | 50 | DN15 Flange |
| 025 | 200 | 80 | 100 | 160 | 25 | 144 | 50 | |
| 032 | 320 | 50 | 72 | 100 | 32 | 144 | 50 | DN25 Flange |
| 036 | 420 | 40 | 58 | 80 | 36 | 144 | 50 | |
| 040 | 520 | 35 | 46 | 65 | 40 | 144 | 50 | |
| 045 | 650 | 26 | 36 | 51 | 45 | 144 | 50 | |
| 050 | 800 | 21 | 29 | 42 | 50 | 144 | 50 | |
| 055 | 1000 | 17 | 24 | 34 | 55 | 144 | 50 | DN40 Flange |
| 060 | 1200 | 15 | 20 | 29 | 60 | 144 | 50 | |
| 065 | 1400 | 12 | 17 | 24 | 65 | 144 | 50 | |
| 070 | 1600 | 10 | 15 | 20 | 70 | 144 | 50 | |
| 080 | 2100 | 8 | 11 | 16 | 80 | 144 | 50 | |
| 085 | 2400 | 7 | 10 | 14 | 85 | 144 | 50 | |
| 090 | 2600 | 6 | 8 | 12 | 90 | 144 | 50 | DN50 Flange |
| 095 | 3000 | 5 | 7 | 11 | 95 | 144 | 50 | |
| 100 | 3500 | 4 | 6 | 9 | 100 | 144 | 50 | |
DIGITAL CONTROL PISTON / HYDRAULIC DIAPHRAGM PUMP
| PLUS | LITE | ||
|---|---|---|---|
| GENERAL | |||
| Display Type | Touch screen HMI | √ | – |
| Back light LCD | – | √ | |
| Operating Method | Touch screen keypad | √ | – |
| Soft button (Start/stop, Up, Down) | – | √ | |
| Information Display | Current flowrate (LPH) | √ | √ |
| Accumulated flowrate (L). Resetable. | √ | √ | |
| Current pressure/level value (Bar / m) | √ | – | |
| Current pump status / warnings | √ | – | |
| Password Protection | To prevent unauthorized personal to make changes | √ | – |
| CONTROL | |||
| Manual | User may set the flow rate in litres/hour via the control panel on the pump itself (P series = touch screen, L series = soft keys) and the pump automatically adjust to dose user’s set flow rate. | √ | √ |
| Signal Control | Current analog (4-20-mA). In this operating mode, the pump doses according to an external analog signal, and the flow rate being pumped is proportional to the signal input value (mA), where 4mA = 0% of the design flow rate and 20mA = 100% of the design flow rate. | √ | √ |
| Current analog reversed (20-4-mA). In this operating mode, the pump doses according to an external analog signal, and the flow rate being pumped is proportional to the signal input value (mA), where 4mA = 100% of the design flow rate and 20mA = 0% of the design flow rate. | √ | √ | |
| Current analog linear mode (mA). In this operating mode, user set 2 values, P1 & P2 (LPH). The pump doses according to an external analog signal, and the flow rate being pumped is proportional to the signal input value (mA), where 4mA = P1 of the design flow rate and 20mA = P2. | √ | √ | |
| Pulse frequency control. In this mode, user set the max. pulse frequency value (Max. 600). The pump can be controlled by receiving a pulse frequency signal from an external source. The pump doses at 100% at max pulse value and 0% at 0 pulse signal. | – | √ | |
| Remote On/Off | Dry contact (normally open). By connecting two wires, the pump can be remotely turn on/off via potential-free contacts. Typically used in programmable logic controllers (PLCs) or a level float switch. | √ | √ |
| Communication | RS485 RTU Modbus. Pumps can be remotely controlled using an Intelligent Pump Controller (IPC) by connecting to a dedicated RS485 terminal strip using a cable from the remote connection device. Common parameters include device address and baud rate. | √ | √ |
| Batch | Doses in batches based on the dosing value (in liters) set in the dosing mode. Can be activated either by receiving a pulse signal or on/off from the pump. If activating via pulse signal, one batch is dosed each time the pump receives an pulse signal. | √ | √ |
| Batch + Timer | Doses in batches based on the dosing value (in liters) at specified time. Instead of activated by pulse or pump on/off, it is activated by the timer. Up to three time points can be set in one day. | √ | – |
| Batch Deviation | Fine tuning batch dosing accuracy. In actual application, there are many factors will affect the dosing accuracy. Users can fine tune the error by entering the differential value. | √ | √ |
| Cycle | Cycle mode runs based on the “Run Time” and “Stop Time” set by the user. Example: “Run Time” is set to 20 minutes, “Stop Time” is set to 30 minutes. When the pump starts, the pump will be run for 20 minutes, stop for 30 minutes, run for 20 minutes, stop for 30 minutes… and repeat this operation. | √ | – |
| Timer | The timer mode runs based on timer. User to set “Start Time” and “Stop Time” in terms of HH:MM:SS. There are 3 sets of timer able to adjust per day. The timer will be repeat everyday. | √ | – |
| OTHER FEATURES | |||
| Low Level Alarm | Low liquid level alarm. Receive low level signal from an external dry contact. | √ | – |
| Pressure / Level Alarm | Alarm/stop the pump according to the level/pressure set point set by the user. This pump can alarm/stop operation according to the signal from the level sensor. Choose one of the two. | √ | – |
| Calibration Function | It has a built-in program to automatically adjust the flow rate. When the installation is complete, the user only needs to enter the actual flow rate. | √ | √ |
| Diaphragm Rupture Sensor | Optional double diaphragm rupture alarm system for safety. (For Hydraulic Diaphragm Pump Only) | √ | √ |
MATERIAL TABLE
| Material Code | Hydraulic Diaphragm Pump | ||
|---|---|---|---|
| Pump Fluid End: | |||
| Pump Head Material | SS316L | PVC | PVDF |
| Diaphragm | Full PTFE | ||
| Inlet & Outlet Valve | Body: SS316L | Body: PVC | Body: PVDF |
| Seat: SS316L | Seat: PTFE | Seat: PTFE | |
| Ball: Ceramic | |||
| Seal | PTFE | FKM | FKM |
| Others | |||
| Pump Body | Cast Iron | ||
*Notes: 1) Above material table refers to the standard models. Customizable material is available upon request.
PISTON PUMP DIMENSION (mm)
HYDRAULIC DIAPHRAGM PUMP DIMENSION (mm)
| L | W | H | |
|---|---|---|---|
| HS | 400 | 242 | 417 |
| HM | 518 | 333 | 481 |
| HL | 629 | 369 | 574 |
| HD | 815 | 507 | 720 |
All dimensions & drawing design are for reference only. Actual dimension & design subject to pump model, size, motor type, connection method, and addons.
Hydraulic Double Diaphragm Dosing Pump Head Structure
Hydraulic Diaphragm Dosing Pumps: Leak-Free Precision for Critical Applications
A hydraulic diaphragm dosing pump combines the robust, high-pressure capabilities of a piston pump with the absolute leak-free safety of a diaphragm design. Built for the most demanding environments, these chemical injection pumps are the industry standard for safely transferring highly toxic, corrosive, or abrasive fluids where exact metering and zero leakage are non-negotiable.
How It Works
Instead of a piston coming into direct contact with the chemical, a hydraulic diaphragm metering pump uses a specialized dual-action mechanism:
-
Hydraulic Transfer: The motor drives a reciprocating piston, which pressurizes a chamber filled with hydraulic fluid (typically oil).
-
Diaphragm Flexing: This pressurized hydraulic fluid pushes uniformly against a flexible diaphragm (usually PTFE), causing it to flex forward and backward.
-
Suction and Discharge: As the diaphragm flexes backward, it creates a vacuum to draw the chemical in. As it pushes forward, it expels a precise volume of the chemical into the process line. The hydraulic fluid perfectly balances the pressure on the diaphragm, protecting it from mechanical stress.
Common Industries & Applications
Because they guarantee zero leakage under extreme conditions, hydraulic diaphragm pumps are essential in high-risk and heavy-duty sectors:
-
Oil and Gas: Injecting flammable or hazardous inhibitors into high-pressure pipelines and wellheads.
-
Chemical & Petrochemical Processing: Safely dosing toxic, reactive, or aggressive industrial chemicals without risking environmental exposure.
-
Power Generation: High-pressure boiler feed water treatment and chemical dosing.
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Water and Wastewater Treatment: Delivering continuous, high-volume doses of harsh coagulants and corrosive chemicals safely.
Why Choose a Hydraulic Diaphragm Pump?
When evaluating chemical injection pumps, the hydraulic diaphragm design offers the “best of both worlds” compared to other positive displacement pumps:
-
Vs. Piston Pumps (Zero Leakage): Unlike piston pumps that require dynamic packing seals (which can eventually wear and leak), the diaphragm creates a complete hermetic seal. This ensures 100% containment of hazardous fluids.
-
Vs. Mechanical Diaphragm Pumps (Higher Pressure & Longevity): Because the diaphragm is supported equally by hydraulic fluid on one side and the process chemical on the other, it does not suffer from uneven mechanical tearing. This allows the pump to handle exceptionally high system pressures with a significantly longer diaphragm lifespan.
-
Built-in Safety: The design inherently includes an internal pressure relief valve within the hydraulic system, automatically protecting the pump from sudden overpressure spikes.
Explore the complete range of WRS hydraulic diaphragm dosing pump models below to find the exact flow and pressure configuration for your critical fluid handling needs.