Introduction
The VEVOR 52 Series is an economical and flexible heavy-duty diaphragm water pump. It provides high-volume water flow with reduced pump cycling, thanks to its large five-chamber diaphragm. Featuring an on-demand switch, 5.5 GPM flow rate, and 70 PSI pressure, the 52 Series is designed to meet specific requirements with predictable performance. A built-in bypass function helps reduce rapid cycling by allowing water to flow back from the outlet to the inlet side of the pump. VEVOR also offers a variety of easy-connect fittings and filters for this pump.
Product Specifications
| Property | Specification |
|---|---|
| Rated Voltage | 12V |
| Rated Pressure | 70 PSI |
| Number of Chambers | 5 PCS |
| Max. Flow | 5.5 GPM |
| Inlet/Outlet Diameter | 1/2" MNPT |
This five-chamber, high-volume pump is driven by a heavy-duty motor, producing flow rates of 5.5 GPM. It is capable of self-priming up to 6 vertical feet and can run dry, positioning it as a price-to-performance leader. The pump also supports various easy-connect fittings and filters.
Features
- 5-chamber diaphragm pump
- Continuous duty operation
- Industry-standard mounting pattern
- Run dry capable for normal workloads
- Automatic operation controlled by pressure switch
- Self-priming
- Quiet operation
- Ignition protected
- Bypass function reduces cycling
Applications
- Pressurized water systems for Yachts/RVs/caravans
- Sprayer fixtures (vehicle-mounted sprayers, electric sprayers)
- Cleaning machines, Humidifiers, water purification, medical apparatus
- Food and beverage filling & liquid transfer
- Solar water systems
- Any other pressurization system
Installation
Materials Required
- Diaphragm pump with related accessories
- At least two pieces of flexible, reinforced hose piping with a collapsing strength twice that of the inlet collapsing pressure (hose must be minimum 1/2" ID)
- Stainless steel hose clamps and screws
- Screws for fastening the pump to the mounting surface
- 1 electrical cut-off switch
- 1 fuse
- 1 screwdriver
- 1 strong cutting implement for tubing (if desired)
- Teflon tape or sealant
Setup Instructions
- The pump can be mounted in any position. If mounted vertically, the pump head should be in the down position to prevent leakage into the motor casing in the event of a malfunction.
- Secure the feet, but do not compress them. Over-tightening the securing screws may reduce their ability to dissipate noise and vibration.
- The inlet and outlet hoses must be 1/2" (13 mm) ID reinforced hoses. The diameter of branch and individual supply lines from the outlet should be no smaller than 3/8" (10 mm).
- Plumb the system using high-pressure (2 x pump rating), braided, flexible tubing to minimize vibration and noise.
- Do not apply inlet pressure in excess of 30psi. In general, try to avoid any inlet pressure completely.
- Avoid any kinks or fittings that could cause excessive restrictions.
- A strainer should be attached to the inlet side.
- Fittings must be secured to avoid leakage.
- Use clamps at both ends of the hose to prevent air leaks into the water line.
- If a check valve is installed in the plumbing, it must have a cracking pressure of no more than 2 psi.
- If applying a sealer or plumbing tape, be careful to not over-tighten, as they may be sucked into the pump.
Electrical Connection and Notes
Wiring
- This pump should be wired on its own dedicated circuit.
- Connect the positive lead (red wire) to the positive terminal of your battery and the negative wire (black wire) to the negative terminal of your battery.
- Install a switch in an easily accessible location to control electricity to the pump. Turn the pump off when not used for extended periods or when the tank is empty.
- The electrical circuit should be protected with an over-current protection device (fuse) in the positive lead. This pump requires a 15 amp fuse.
- The pump circuit should not include any other electrical loads.
- As the water supply pump is non-essential, reference the wire chart under the electrical information. Ensure correct wire sizing for the length of wire being used.
- After installation, check the voltage at the pump motor while it is operating. Full voltage must be available at the pump motor at all times.
Notes
- Flexible potable water hose or PEX tubing is recommended instead of rigid piping at the pump. If using rigid piping, provide a short length of hose between the pipe and the pump to avoid noise and vibration.
- VEVOR does not recommend the use of metal fittings. When possible, use the provided plastic fittings.
- Do not adjust the bypass personally without the help of a technician.
- Lack of sanitizing and maintenance is a primary cause of pump underperformance. Perform maintenance and winterize the pump at appropriate times, especially before and after a period of storage.
Accessories and Exploded View
Included Accessories
| Item | Quantity |
|---|---|
| Hose Adapter | 2 |
| Filter | 1 |
| Hexagon Bolt | 1 |
| Sealing Tape | 1 |
| 3/4" Copper Hose Adapter | 1 |
Exploded View
A diagram illustrating the pump's components is provided, with a key identifying each part:
| Key | Description | Quantity |
|---|---|---|
| 1 | Pressure Switch | 1 |
| 2 | Diaphragm of Pressure Switch | 1 |
| 3 | Bypass Switch | 1 |
| 4 | Pump Head | 1 |
| 5 | Diaphragm | 1 |
| 6 | Iron Feet Group | 1 |
| 7 | Motor | 1 |
Product Size
The pump dimensions are approximately: Length 219.2mm (8.63 inches), Width 76.5mm (3.01 inches), Height 148mm (5.83 inches) and 131mm (5.16 inches).
Troubleshooting
Pulsating Flow - Pump Cycles On and Off
- Check lines for kinks.
- Plumbing lines or fittings may be too small.
- Clean faucets and filters.
- Check fitting tightness for air leaks.
Failure to Prime but Motor Operates - No Pump Discharge
- Restricted intake or discharge line.
- Air leak in intake line.
- Punctured pump diaphragm.
- Insufficient initial amp supply to start the motor.
- Debris clogs in the valves.
- Crack in the pump housing.
Motor Fails to Turn On
- Loose or improper wiring.
- The pump circuit has no power.
- Blown fuse.
- Failed pressure switch.
- Defective motor.
Pump Fails to Turn Off After All Fixtures Are Closed
- Punctured diaphragm.
- Discharge line leak.
- Defective pressure switch.
- Insufficient voltage.
- Clogged valves in the pump head.
Low Flow and Pressure
- Air leak at the pump intake.
- Accumulation of debris inside pump or plumbing.
- Worn pump bearing (possibly accompanied by loud noise).
- Punctured diaphragm.
- Defective motor.
Noisy Operation
- Check if the mounting feet are compressed too tightly.
- Is the mounting surface flexible? If so, it may be adding noise.
- Check for loose head/screws.
- If the pump is plumbed with rigid pipe, it may transmit noise more easily.
Adjusting Shut-Off and Bypass Pressures
Follow this process to adjust the pump's pressure settings:
- Install the pump as shown in the product diagrams.
Adjusting the Bypass Valve and Pressure Switch
TIP: Bypass adjustment should ideally be performed by a professional technician using proper gauge and equipment. Without the correct equipment, mis-adjustment could cause the pump to work improperly.
About the Bypass Valve
The pump utilizes a spring-loaded bypass valve to maintain smooth performance as water demand fluctuates. When a faucet is turned on, the pump provides full water flow, and the bypass valve remains closed. However, when there is little to no water demand, the bypass valve opens, allowing water to flow back from the outlet side to the inlet side. This action keeps a steady flow of water within the pump, minimizing cycling.
Adjusting the Pump's Shut-Off Pressure: (1)
- To raise the shut-off pressure, use a 2mm Allen wrench to turn the pressure switch screw clockwise to the desired pressure.
- To lower the shut-off pressure, use a 2mm Allen wrench to turn the pressure switch screw counter-clockwise to the desired pressure.
Adjusting the Bypass: (2)
- To raise the pressure at which the bypass starts and increase the full bypass pressure, use a 2mm Allen wrench to turn the bypass screw clockwise to the desired pressure.
- To lower the pressure at which the bypass starts and decrease the full bypass pressure, use a 2mm Allen wrench to turn the bypass screw counter-clockwise to the desired pressure.
CAUTION: The pressure setting for full bypass must be at least 8psi higher than the shut-off pressure of the pump. If the switch and bypass are adjusted too closely, they can overlap, preventing the pump from shutting off.
ABOUT THE BYPASS: Please consult a professional technician if the bypass requires adjustment. Improper adjustment may damage the pump. The bypass is preset for optimal operation. If your application requires a different setting, you may change it yourself by carefully tightening the screw to increase or loosening the screw to decrease the minimum operating pressure of the bypass.
CAUTION: Please follow the instructions in this manual for product installation. Any action outside of these recommendations may damage the pump. Damage caused by inappropriate installation or operation is not covered by warranty.
FCC Information and Manufacturer
FCC Information
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
This product is subject to the provision of European Directive 2012/19/EC. The symbol of a wheelie bin crossed through indicates that the product requires separate refuse collection in the European Union. This applies to the product and all accessories marked with this symbol. Products marked as such may not be discarded with normal domestic waste but must be taken to a collection point for recycling electrical and electronic devices.
*There may be minor changes to the numbers included in the user manual without prior notice.
Manufacturer Information
Manufacturer: Xiamen Newmao Pump Co., Ltd
Address: 2nd Pak of Zone III, Floor 3, Main Building of Huaxin General Facto;, No. 216, Huanzhu Road, Qiaoying Street, Jimei District, Xiamen
