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 redu...

Whenever a high pressure calibration pump is needed, we offer several portable, hydraulic test pump models designed to work seamlessly with a reference gauge and process connection. The QTHP reaches test pressures up to 5000 psi (35 MPa) while the XTHP reaches test pressures up to 10,000 psi (70 MPa). Both provide solid, steady pressure without having to lock a stroke-limiting knob, and both feature a unique, balanced design with the pressurized section located below the reservoir, which prevents toppling and adds an unrivaled level of convenience. An integral part of any pressure testing process, our lightweight and durable hydraulic test pumps are compatible to use with most liquids. They’re ideal for pressure transmitter calibration, pressure switch testing, leak testing pressure instruments, and field testing wherever power inputs are unavailable or unsuitable. QTHP The sleek design of the new QTHP 35 MPa Hydraulic Hand Pump allows you to reach test pressures up to 5000 psi without having to lock a stroke-limiting knob. It’s compact and easy to use, and because it’s machined from solid stainless steel, it provides steady, stable pressure with absolute precision. Lightweight and easy to use — weighs only 1.4 kg, and with the pressurized section located below the reservoir, it’s well balanced and easy to hold and pump with one hand Extremely durable — the liquid reservoir is highly resistant to shock, extreme temperature and chemical exposure, and it’s far less prone to shattering. Sturdy metal handles won’t wear out or break when dropped Easy to disassemble and repair with standard hand tools Machined from solid, stainless steel preventing pressure leaks common in housings made from cast material and ensuring consistent, stable pressure Includes Ralston Quick-test adapters and hoses for quick & efficient connection Compatible with most liquids (Alcohol, Antifreeze, Ethylene Glycol, Hydraulic Oil, Mineral Oil, Petroleum Based Oil, Windshield Wash...

Manual pneumatic pumps Ralston DCAP are reliable tools for precise pressure calibration, designed to perform in a wide range of environments. With their straightforward and intuitive design, these pumps are an ideal choice for both laboratory applications and fieldwork.   They allow you to quickly generate the necessary pressure or vacuum for testing gauges, sensors, and other measuring instruments. Durable materials and high accuracy ensure long-term performance, meeting the demands of even the most meticulous users.   Combining compactness, ease of use, and precise pressure control, these pumps are indispensable for professionals in the calibration field. DCAP An exceptionally durable hand pump for use in the field for doing pressure calibration, testing and custody transfer. Perform pneumatic field calibrations on pressure transmitters, switches or gauges using an external pressure calibrator as the reference Pressure calibration can be performed without electricity or nitrogen Two outlet ports allow the user to attach pump to both device under test and external pressure reference thus eliminating a tee Fine adjustment piston allows the user to achieve an exact pressure for cardinal point pressure calibrations Precisely vent pressure with soft seated bleed valve 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 improves temperature and pressure stability DCAP-PV A versatile, easy-to-use pressure pump that allows you to quickly switch to vacuum testing with just a turn of a knob, the Ralston DCAP-PV Pressure / Vacuum Hand Pump is ideal for calibrating DP pressure transmitters, testing pressure switches or checking pressure gauges in the field. Features Ability to generate pressure to 650 psi / 4.5 MPa Ability to generate vacuum to 28.5 inHg / 710 mmHg Quick switch from pressure to vacuum testing at the turn of a knob - ...