An economical solution for low-pressure applications, we offer three cylinder hand pump options with a modular design that makes field maintenance quick and easy. Our DP0V model provides reliable test pressure up to 125 psi (860 kPa), the DV0V provides vacuum to -23 inHg (-78 kPa), and the DPPV allows quick conversion from pressure to vacuum from -23 inHg (-78 kPa) to 125 psi (860 kPa). All Ralston pneumatic cylinder hand pumps feature simple, direct-acting pump action with a fine-adjust piston that gives you extremely precise pressure control. They’re perfect for calibrating DP pressure transmitters, testing pressure switches or checking pressure gauges in the field.

DV0V

Generate vacuum to calibrate vacuum devices in the field

Lightweight, compact pump generates 23 inHg (584mm Hg)vacuum with ease
Large volume fine adjustment piston provides precise control, even at very low vacuums
Modular design makes field maintenance quick and easy
Precisely vent pressure with soft seated bleed valve
Two outlet ports provide connections for both pressure reference and for device under test thus eliminating a tee
Low volume Quick-test hose, gauge adapter and process connection can be attached to pump without thread sealant or a wrench
Rugged, all metal construction reduces pressure changes due to temperature fluctuations

DP0V

Economical solution for calibration of low pressure differential transmitters. Simple direct-acting pump action with fine adjustment piston makes an easy and precise pressure setting

Lightweight, compact pump generates 125 psi (8.6 bar) pressure with ease
Modular design makes field maintenance quick and easy
Precisely vent pressure with soft seated bleed valve
Two outlet ports provide connections for both pressure reference and for device under test thus eliminating a tee
Low volume Quick-test hose, gauge adapter and process connection can be attached to pump without thread sealant or a wrench
Rugged, all metal construction reduces pressure changes due to temperature fluctuations

DPPV

Generate vacuum or a pressure for calibrating low pressure or vacuum instrumentation

Generate either 125 psi (8.6 bar) pressure or 23 InHg (584 mm Hg) vacuum with the same pump
Unique design allows the user to convert from pressure to vacuum by simply twisting a knob, even with gloves on
Two outlet ports allow connection to reference pressure gauge or pressure calibrator as well as device under test, thus eliminating a tee
Large volume fine adjustment piston provides precise control, even at very low pressures
Low volume Quick-test hose, gauge adapter and process connection can be attached to pump without thread sealant or a wrench
Precisely vent pressure with soft seated bleed valve
Rugged, all metal construction reduces pressure changes due to temperature fluctuations