They indicate the internal pressure within vessels or systems and are used particularly for environments where the pressure changes frequently, therefore requiring constant monitoring. Read More…
Leading Manufacturers
HydraCheck
West Valley City, UT | 800-316-5342The pressure gauges that we are able to manufacture will withstand the tests of time in order to provide a lasting value! We are dedicated to serving customers around the world with our products! It is our goal that we are able to offer products to our customers that fit their exact needs. To learn more about what we may be able to do for you; visit us online today!
Seal Fast Inc.
Houston, TX | 713-675-6324Since 1933, Seal Fast has been a leading manufacturer and wholesale distributor of hoses, couplings, valves, gauges and fittings. To support our products we also manufacture the instrumentation needed to ensure optimal functionality with thermowells, dry and wet process pressure gauges and more. With locations across the U.S., Seal Fast is your #1 source in quality products and excellent service.
Differential Pressure Plus, Inc.
Branford, CT | 203-481-2545Differential Pressure Plus manufactures quality pressure gauges for air, gases, liquids and chemicals used in the filtration industry. Our digital or standard gauges are made of stainless steel, aluminum, ceramic, Teflon® and Buna. Check out our new Backflow Preventer Test Kit.
United Instrument Company
Northvale, NJ | 800-920-8186Since 1932, United Instrument Company has provided digital pressure gauges to the marine and industrial industries. In addition to our own gauges we also supply customers with Weksler, Ametek, Wika, Weiss, Ashcroft and Fluke products. We pride ourselves in our excellent and successful employee-to-customer relationships. Become one of our new customers today.
REOTEMP Instrument Corporation
San Diego, CA | 858-784-0710REOTEMP Instrument Corp. is an ISO 9001-registered company specializing in pressure gauges, stainless steel gauges, low pressure gauges, differential gauges and more. We offer different types of windows, casings, movements and tubes with which to build or to design a custom precision pressure gauge.
A differential pressure gauge's components are housed in a metal enclosure; materials include stainless steel, cast iron, bronze, brass and aluminum. The windows are usually double-strength glass. Specific pressure gauges have additional materials such as plastic or rubber. Differential liquid pressure gauges are themselves filled with certain liquids including oil, glycerin and silicone. Pressure gauges are often used in tandem with protective accessories like shutoff valves.
Other accessories include pipe coils, chemical seals and secondary valves to minimize condensation and to allow calibration against an external pressure source such as atmospheric pressure. Differential pressure gauges have two inlet ports that monitor the pressure in two separate vessels. These pressure gauges are used in applications where it is important to take two measurements and compare them, determining which vessel or system has the highest flow velocity, for example. Differential pressure gauges are utilized by manufacturing and industrial plants and companies.
Differential pressure gauges perform subtraction in order to indicate the difference between the two readings. This eliminates the need for an operator or computer system to watch two gauges and perform the math. It is fast and efficient to have the information immediately and constantly displayed in one location. There are three main types of differential pressure gauges: Bourdon, diaphragm and piston. The Bourdon gauge has two C-shaped or coiled tubes connected to the chambers or pipes where the pressures must be read.
When pressure increases, the tubes uncoil. The motion of the two tubes is registered and a mechanical linkage compares the readings. Diaphragm gauges use two hermetically sealed membranes that flex in accordance with the pressure. The ports of the membranes are open to each other to compare pressures.
Piston type differential pressure gauges are also called deadweight testers because they counterbalance the pressure of a fluid with a solid weight or spring. As is the case with all three kinds, the difference is measured by a sensor and indicated on the gauge. The results may be displayed as analog, such as a needle on a dial, or they may be digital with numbers on a LED panel.