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About Ralston Instruments

Made in the USA — The Ralston Way

When precise, reliable pressure calibration is essential, trust Ralston Instruments. For over 40 years, we've engineered pressure calibration equipment and systems for a wide range of applications, saving time and taking the guesswork out of critical pressure testing, maintenance and repair operations.

  • First Pneumatic Hand Pump

    1969 — First Pneumatic Hand Pump

  • first_pneumatic_hand_pump

    1970 — First Hydraulic Hand Pump

Founded in 1969 by Doug Ralston, today Ralston Instruments continues to be a family owned company with a proud history of innovation. Responding to the demand for convenient, accurate ways to calibrate pressure instruments in industries around the globe, Ralston invented the first hand held pneumatic pump in 1969, followed by the development of the first hydraulic hand pump in 1970.

That passion for advancing pressure calibration components remains undiminished. In 1993, RI launched the first fully integrated system of Quick-test™ hoses and adapters. Designed for low volume, high pressure connections to virtually any device being tested, this unique design offers secure, time-saving connections without using a wrench or thread sealant. Ralston's integrated calibration pressure sources are the ultimate solution for performing differential or static pressure calibrations using nitrogen or compressed gas.

All Ralston products are made in the USA using superior design and manufacturing techniques. These products include hand pumps, compressed gas control devices, hoses, adapters, and complete calibration kits.

When the job requires hand pumps that deliver pressure, hoses and adapters for fast, fail-safe connections, or precision calibration tools, Ralston Instruments provides the most complete pressure calibration solutions whether in the laboratory or in a remote location.

Ralston Milestones

1969
First Pneumatic Hand Pump
1970
First Hydraulic Hand Pump
1987
First Calibration Manifold
1993
First complete system of Quick-test™ hoses
2001
Pressure/Vacuum Hand Pump
2003
Nitropak
2006
Volume Controller
2008
Male NPT Quick Disconnect
2009
10,000 psi hose and adapters



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Displaying products 1 - 30 of 80 results
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Ralston Pneumatic Pressure/Vacuum Hand Pumps
Price: From $477.98 to $873.48
Ralston Pneumatic Pressure/Vacuum Hand Pumps
Ideal solution for either differential pressure or vacuum calibration using precision test gauge or pressure calibrator as the pressure reference. Not for use in Oxygen systems.
Ralston LC10 Vacuum Digital Gauge
Price: From $379.00 to $399.00
Ralston LC10 Vacuum Digital Gauge
The LC10 is a robust device that measures and displays pressure readings on a large, backlighted screen. The LC10 has the ability to show High and Low pressure values on-screen, change between 15 different units. It's 1/4" Male NPT bottom connection.
Ralston FieldLab 5kpsi / 35 MPa Hydraulic hand pump
Price: From $2,378.98 to $2,478.98
Ralston FieldLab 5kpsi / 35 MPa Hydraulic hand pump
5kpsi / 35 MPa Hydraulic hand pump, with 3 pressure options to choose from 1,000 psi, 3,000 psi, 5,000 psi with FieldLab A brand new way of thinking about calibration, use this FieldLab to create tests, put them on one or more FieldLabs & log the results
Ralston 5kpsi / 35 MPa Hydraulic hand pump
Price: From $479.98 to $525.52
Ralston 5kpsi / 35 MPa Hydraulic hand pump
5kpsi / 35 MPa Hydraulic hand pump
Ralston 5kpsi / 35 MPa Hydraulic hand pump, digital pressure gauge
Price: $895.48
Ralston 5kpsi / 35 MPa Hydraulic hand pump, digital pressure gauge
5kpsi / 35 MPa Hydraulic hand pump, (1,000 psi, 3,000 psi, 5,000 psi) digital pressure gauge
Ralston 10kpsi / 70 MPa Hydraulic hand pump
Price: From $952.90 to $999.10
Ralston 10kpsi / 70 MPa Hydraulic hand pump
10kpsi / 70 MPa Hydraulic hand pump, 2 Quicktest XT outlet ports, 3 ft hose, 1/4" MNPT Process conn.
Ralston DCAP-PV Pressure / Vacuum Hand Pump
Price: From $786.26 to $826.16
Ralston DCAP-PV Pressure / Vacuum Hand Pump
650 psi (4.5 Mpa) pressure / 28.5 inHg (97 kPa) vacuum hand pump, 2 Quick-test outlet ports, 3 ft hose, 1/4" MNPT Process conn.
Ralston Pneumatic Cylinder Hand Pumps
Price: From $349.98 to $745.48
Ralston Pneumatic Cylinder Hand Pumps
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. Not for use in Oxygen systems.
Ralston Vacuum Cylinder Hand Pumps
Price: From $349.98 to $745.48
Ralston Vacuum Cylinder Hand Pumps
An outstanding solution for performing vacuum calibration in the laboratory or in the field where the pressure reference is attached to the pump with integral test gauge adapter. Not for use in Oxygen systems.
Ralston Hydraulic Hand Pumps
Price: Discontinued
Ralston Hydraulic Hand Pumps
Lightweight, high pressure source that can use oil or water as the test fluid.
Ralston Gas Sampling Pumps
Price: From $631.90 to $1,013.60
Ralston Gas Sampling Pumps
An outstanding solution for taking gas samples in the field for analysis in the lab. The SP0V gas sampling pump can pull low pressure gas from a well and boost it to 25 psi to pump it into a sample cylinder.
Ralston DCAP Pressure Test Hand Pump
Price: From $686.30 to $2,585.30
Ralston DCAP Pressure Test Hand Pump
650 psi (45 bar) pneumatic hand pump, 3ft hose, 1/4" Male NPT process conn, 3 ft hose
Ralston Nitrogen Calibration Sources
Price: From $4,398.00 to $4,947.56
Ralston Nitrogen Calibration Sources
Self contained unit provides a precise nitrogen source for calibrating differential and static pressure instrumentation using an external pressure calibrator
Ralston Calibration Manifolds
Price: From $304.80 to $460.80
Ralston Calibration Manifolds
The most economical way of performing static pressure calibrations in the field using nitrogen or other compressed gas. Fine adjustment piston provides precise pressure control.
Ralston Calibration Manifold Kit
Price: From $304.80 to $1,152.70
Ralston Calibration Manifold Kit
An excellent solution for doing static pressure calibrations with compressed nitrogen gas. Brass and stainless steel manifolds are available to provide solutions for every type of environment.
Ralston Volume Controllers
Price: From $1,516.00 to $1,941.50
Ralston Volume Controllers
Perform both ultra-precise low pressure differential or high pressure static pressure calibrations with nitrogen using the same device.
Ralston In-line Vent Valves
Price: From $84.00 to $142.80
Ralston In-line Vent Valves
Use to slowly or quickly bleed pressure from a line after a calibration is complete
Ralston Block and Bleed Valves
Price: From $138.00 to $228.00
Ralston Block and Bleed Valves
Keep a calibration system pressurized with a fluid or gas while venting the pressure from the device being calibrated
Ralston In-line Verniers
Price: From $129.00 to $210.00
Ralston In-line Verniers
Connect one end to a Quick-test hose and the other to the process connection then turn the knob to control the pressure
Ralston 7/16-20 male Medium Pressure x male Quick-test, S.S
Price: $49.00
Ralston 7/16-20 male Medium Pressure x male Quick-test, S.S
Ralston 7/16-20 male Medium Pressure x male Quick-test, S.S
Ralston Fluid and Moisture Traps
Price: From $329.50 to $339.00
Ralston Fluid and Moisture Traps
Increases confidence and efficiency in pneumatic calibrations by eliminating unwanted fluid or moisture that can contaminate a pressure calibrator or Nitropak
unavailable
1-8" Pete's Plug Probe Stainless Steel
Price: From $84.00 to $86.00
1-8" Pete's Plug Probe Stainless Steel
1-8" Pete's plug Probe Stainless Steel (1/8" diameter x 1.5 long)
Ralston Hose Accessories
Price: From $19.00 to $30.80
Ralston Hose Accessories
Reels and bags to manage hoses more effeciently
Ralston Replacement Parts
Price: From $1.26 to $898.00
Ralston Replacement Parts
Replacement parts for Ralston hand pumps, calibration manifolds, nitrogen sources and volume contollers
Ralston Replacement Outlet Ports
Price: From $10.00 to $38.50
Ralston Replacement Outlet Ports
Outlet ports used on hand pumps, nitrogen sources, volume controllers.
Ralston Quick-test Benchtop Manifolds
Price: From $548.00 to $988.00
Ralston Quick-test Benchtop Manifolds
Ideal for testing multiple pressure instruments at once up to 5000 psi (350 bar).
Ralston Quick-test XT Benchtop Manifolds
Price: From $598.00 to $1,068.00
Ralston Quick-test XT Benchtop Manifolds
Ideal for testing multiple pressure instruments at once up to 10,000 psi (700 bar).
Ralston Quick-test Bulkhead Connections
Price: From $34.10 to $49.10
Ralston Quick-test Bulkhead Connections
Excellent for safely connecting two Quick-test hoses through an enclosure, truck, or panel wall
Ralston Replacement Gauge Swivels
Price: From $14.10 to $38.40
Ralston Replacement Gauge Swivels
Use to mount gauges on Ralston Instruments model APGV, HPGV, XHGV hand pumps
Ralston Valved Fittings
Price: From $98.50 to $198.00
Ralston Valved Fittings
Install between a pressure gauge and the process and isolate the process from the gauge to perform a calibration of the gauge. After completing the calibration open the valve and place the gauge on-line, all without blowing down the system.
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