Ralston Instruments DP0V Pneumatic Cylinder Hand Pumps User Manual

: October 30, 2023
: Ralston Instruments

Table of Contents

Specifications
Requirements
Important Safety Notices
Pneumatic Cylinder Hand Pump Overview
Setting Up
Calibration
Venting System
Storage and Transport
Maintenance
Troubleshooting
Support
Documents / Resources

Ralston Instruments DP0V Pneumatic Cylinder Hand Pumps User Manual

For all models of DP0V Pneumatic Cylinder Hand Pumps

Instructions

Specifications

Pressure Range	0 to 125 psi (0 to 9 bar)
Media	Air
Pressure Reference Port	Male Ralston Quick-test™ outlet port, no check valve,

Requirements

What you need to use your Pneumatic Cylinder Hand Pump:

Device Under Test
Wrench
Thread Tape
Ralston Quick-test™ Adapters
Ralston Quick-test™ Hose
Pressure Reference

Important Safety Notices

WARNING : Do not exceed Maximum Working Pressure for this product or damage may result.

WARNING : Device under test should be isolated from the process, vented and vent valve closed prior to use.

WARNING : Do not attempt to operate this pump until you have read and fully understand the instructions and hazards of the product.

Any modifications to this product with custom parts can result in hazardous operation of the hand pump.
Use eye protection while using this product. Leaking gas, parts or hoses can be ejected at high speed and may cause injury.

Pneumatic Cylinder Hand Pump Overview

Back
Pneumatic Cylinder

Pumping Piston
Pressure Reference Port
Bleed Valve
Pressure Outlet Port
Fine Adjust Piston
External Check Valve
Internal Check Valve

Setting Up

Connecting Reference Gauge

Reference Gauge with NPT male connection
NPT Female Ralston Quick-test™ Gauge Adapter
Ralston Quick-test™ Hose
NPT Female Ralston Quick-test™ Adapter

or

Male BSPP Reference Gauge

Reference Gauge with BSPP male connection
BSPP Washer
BSPP Female Ralston Quick-test™ Adapter
Ralston Quick-test™ Hose
BSPP Female (RG) Ralston Quick-test™ Adapter

or

Female NPT Pressure Reference Gauge

Reference Gauge with NPT female port
NPT Male Ralston Quicktest™ Gauge Adapter
Ralston Quick-test™ Hose
NPT Male Ralston Quick-test™ Adapter

or

Connecting Device Under Test (DUT)

Isolate the Device Under Test (DUT) from the process and vent DUT prior to connecting to it.
Connecting Device

Device under test (DUT)
NPT Male Ralston Quick-test™ Adapter
Ralston Quick-test™ Hose

Calibration

Prepare the Pump

Open Bleed Valve
Set Fine Adjust to 50%
Close Bleed Valve.

Increase Pressure

Increase Pressure

Pump to just below test point.
ine-adjust to exact test point.

Repeat steps 1 through 2 for each test point up-scale.

Decrease Pressure

Decrease Pressure

Slowly bleed to just above the test point. Then, close Bleed Valve.
Fine-adjust to exact test point

Repeat steps 1 and 2 for each test point down-scale.

Venting System

When finished testing, open the Bleed Valve and vent the remaining pressure from the system.

Storage and Transport

Ralston Pneumatic Cylinder Hand Pump Carrying Case (DP0V-CASE). Sold separately

Maintenance

Maintenance Interval
Every 300 uses or 3 months

Maintenance Procedure

Lubricate External Check Valve by squirting 2 ml of oil into it, and then drawing the oil into the Check Valve by pumping the piston several times.
Lubricate Internal Check Valve by removing pumping piston and squirting 2 ml of oil into hole in Check Valve at bottom of pumping piston cavity. When pump is pumped oil will be drawn into the Check Valve.
Lubricate the Ralston Quick-test™ fittings by squirting 2 ml of oil inside the connection.
Lubricate the pumping piston and the fine adjust piston O-rings with silicone lubricant.

Troubleshooting

The pump will pump up, but pressure slowly decreases
If the pump will pump up, but pressure slowly decreases, then there is an external leak. Follow these instructions to locate and repair the leak:

Connect the pump to a Device Under Test (DUT) with a Ralston Quick-test™ hose.
Make sure the process connections are assembled wrench-tight.
Pressurize the Hand Pump.
Spray soapy water or leak detection fluid where leaks are suspected or immerse the pump in water. Be careful not to immerse the pressure gauge or calibrator.
Observe where bubbles are forming to determine where there is a leak.
Remove the leaking part and remove the cut or damaged O-ring.
Clean and lubricate the O-ring.
Replace the O-ring and reassemble.

Pumping Piston pushes out by itself and pressure decreases
If the Pumping Piston pushes out by itself and pressure decreases, then the internal Check Valve is not functioning properly. Follow the instructions to replace the internal Check Valve:

Remove the Pumping Piston.
Remove the Internal Check Valve.
Clean and lubricate the Check Valve.
Reinstall the Check Valve.
Reinstall the Pumping Piston.

When the Pumping Piston is pumped, pressure does not increase and air is felt coming out of the external Check Valve located opposite of the Bleed Valve.

If when the Pumping Piston is pumped, pressure does not increase and air is felt coming out of the External Check Valve located opposite of the Bleed Valve, then the External Check Valve is not functioning properly. Follow instructions to replace the External Check Valve:

Remove the External Check Valve
Clean and lubricate the External Check Valve.
Reinstall the External Check Valve.

The pumping piston is difficult to pump.
If the pumping piston is difficult to pump after years of use, then apply a thin coat of graphite grease, such as Dow Corning® Moly-kote G-n Metal Assembly Paste (or equivalent).

If the issue was not resolved by these troubleshooting instructions, then please contact support listed on page 32.

Support

Pneumatic Cylinder Hand Pumps (DP0V)

For all models of DP0V Pneumatic Cylinder Hand Pumps

Ralston Instruments Logo

Documents / Resources

| Ralston Instruments DP0V Pneumatic Cylinder Hand Pumps [pdf] User Manual
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