Calibration Test Pumps

High-precision calibration & pressure testing is the key to success in the oil & gas, petrochemical, maritime, pharmaceutical and aerospace industries and the right calibration tools make all the difference. Ralston Instruments offers a wide array of intelligently designed, high-quality calibration test pumps that simplify complex calibration processes while providing fast, accurate results. All Ralston pressure test pumps are lightweight, extremely durable, and easy to disassemble and repair with standard hand tools. And for quick connectivity with the most effective results, they all come with Ralston Quick-test™ adapters for safe, stable, leak-free connections without the need for a wrench or thread tape.

From high-pressure hydraulic calibration test pumps to very low pressure cylinder hand pumps, we offer a complete suite of high-quality, portable calibration test pumps that cater to a variety of industries and applications.

Hydraulic Calibration Test Pumps

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.

Pneumatic Scissor Hand Pumps

Ralston offers two types of pneumatic scissor hand calibration test pumps. The DCAP model lets you reach test pressures up to 650 psi (4.5 MPa), while the DCAP-PV can quickly switch from pressure to vacuum, generating vacuum to 28.5 inHg (710 mmHg) with the help of a dual-pressure output and built-in vent valve that converts between pressure and vacuum with a simple twist of a knob. Both the DCAP and DCAP-PV have a greater displacement than similar hand pumps on the market, so test pressure or vacuum is built quickly with fewer pump strokes. The DCAP and DCAP-PV Pneumatic Scissor Hand Pumps are ideal for field testing, pressure calibration, and differential pressure testing. They generate low to medium pressure or vacuum with ease, so you can get out to the test site, get calibrating, and quickly get on to the next job.

Pneumatic Cylinder Hand Pumps

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.

Let us help you find the right calibration test pump for your industry and application. Discuss your requirements with us and we'll help you make the right choice for your application.

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