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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
Displaying products 1 - 30 of 75 results
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Ralston Analog Pressure Gauges
Price: From $82.00 to $360.00
Ralston Analog Pressure Gauges
Analog test gauges are convenient for field calibrations. A knife-edge pointer and mirrored band make reading the gauge very easy. An economical choice for calibrating pressure instruments.
Ralston Volume Controllers
Price: From $1,484.00 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 Digital Pressure Gauges
Price: $358.00
Ralston Digital Pressure Gauges
Calibrate pressure instruments in the field or laboratory with a battery powered digital pressure gauge that is easy to read, accurate and reliable.
Ralston Nitrogen Calibration Sources
Price: From $4,240.00 to $4,742.00
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 Vacuum Cylinder Hand Pumps
Price: From $336.30 to $710.00
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 Pneumatic Pressure/Vacuum Hand Pumps
Price: From $460.00 to $821.00
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 Pneumatic Cylinder Hand Pumps
Price: From $336.50 to $700.00
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 Pneumatic Scissor Hand Pumps
Price: From $343.50 to $728.00
Ralston Pneumatic Scissor Hand Pumps
Quick and efficient pneumatic field testing or pressure transmitters, gauges or switches is aided by an integral gauge adapter or for use with an external calibrator as the reference. Not for use in Oxygen systems.
Ralston Hydraulic Hand Pumps
Price: From $438.00 to $790.00
Ralston Hydraulic Hand Pumps
Lightweight, high pressure source that can use oil or water as the test fluid.
Ralston Gas Sampling Pumps
Price: From $595.00 to $957.00
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.
unavailable
1-8" Pete's Plug Probe Stainless Steel
Price:
1-8" Pete's Plug Probe Stainless Steel
1-8" Pete's plug Probe Stainless Steel (1/8" diameter x 1.5 long)
Ralston Calibration Manifolds
Price: From $314.00 to $1,079.00
Ralston Calibration Manifolds
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 In-line Vent Valves
Price: From $80.00 to $136.00
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 $132.00 to $230.00
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 $122.00 to $234.00
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 DCAP Pressure Test Pump
Price: From $634.50 to $2,533.50
Ralston DCAP Pressure Test Pump
650 psi (45 bar) pneumatic hand pump, 3ft hose, 1/4" Male NPT process conn, 3 ft hose
Ralston Hose Accessories
Price: From $19.00 to $29.00
Ralston Hose Accessories
Reels and bags to manage hoses more effeciently
Ralston Replacement Parts
Price: From $1.20 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 $46.20
Ralston Replacement Outlet Ports
Outlet ports used on hand pumps, nitrogen sources, volume controllers.
Ralston Quick-test Benchtop Manifolds
Price: From $526.00 to $968.00
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 $568.00 to $1,018.00
Ralston Quick-test XT Benchtop Manifolds
Ideal for testing multiple pressure instruments at once up to 10,000 psi (700 bar).
Ralston Fluid and Moisture Traps
Price: From $310.00 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
Ralston 1/4" NPT Female Quick-test XT Gauge Adapter
Price: $43.00
Ralston 1/4" NPT Female Quick-test XT Gauge Adapter
Connect Male NPT pressure gauge or other Male NPT device to a Ralston hand pump or nitrogen calibration device to create one side of a quick-disconnect to 10,000 psi
Ralston 37 degree Flare (AN/JIC) Quick-connect Adapters
Price: From $61.00 to $68.00
Ralston 37 degree Flare (AN/JIC) Quick-connect Adapters
Connect a male 37° flare AN/JIC fitting to a Quick-test hose without a wrench
Ralston Adapter Accessories
Price: From $1.00 to $10.00
Ralston Adapter Accessories
Caps, bonded seals and copper washers provide replacement seals for adapters
Ralston BSPP Female (RG) Quick-connect Adapters
Price: From $63.00 to $98.00
Ralston BSPP Female (RG) Quick-connect Adapters
Connect directly to the bottom of BSPP pressure gauges without a bonded seal or crush washer
Ralston BSPP Female (RG) Quick-test Adapters
Price: From $20.00 to $35.00
Ralston BSPP Female (RG) Quick-test Adapters
Connect Male BSPP (ISO 228/1) parallel thread to Quick-test hose for temporary installation
Ralston BSPP Female (RG) Quick-test Gauge Adapters
: $32.00
Price: From $30.00 to $35.00
Ralston BSPP Female (RG) Quick-test Gauge Adapters
Connect Male BSPP (ISO 228/1) parallel thread pressure gauge or other Male BSPP device to a Ralston hand pump or nitrogen calibration equipment
Ralston BSPP Male (RS) Quick-test Adapters
Price: From $13.00 to $58.00
Ralston BSPP Male (RS) Quick-test Adapters
Connect Female BSPP (ISO 228/1) parallel thread to Quick-test hose for temporary installation
Ralston BSPP Male (RS) Quick-test Fittings
Price: From $22.00 to $73.00
Ralston BSPP Male (RS) Quick-test Fittings
Connect Female BSPP (ISO 228/1) parallel thread to Quick-test hose for permanent installation where frequent calibrations are performed
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