Midwest Instruments Distributor (171 Products)
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We are closed from Monday, Dec 23rd and will reopen on Monday, Jan 6th. Any orders received during this time will be processed in the New Year.
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MIDWEST INSTRUMENTS

For more than 50 years, Mid-West Instrument has been offering high-performance differential pressure products. They are ideal for filter monitoring, backflow prevention, natural gas filtration, strainer monitoring, reverse flow detection, Cryogenic / liquid tank level measurement and more applications. Read More

Filter

Plumbing

Test Instruments

Plumbing Filter

Check Valves and Backflow PreventersView all

  • Backflow Preventer Test Kits

    Includes 5-valve backflow test kits with a 90-micron filter to minimise plugging and brass needle valves (with replaceable valve seats). Provide differential pressure up to 15 psi at +/- 0.2 psid accuracy. Connecting adapters, replacement hoses, bleed-off valves and filters also available

About Midwest Instruments

The brand's catalogue comprises differential pressure gauges, switches and transmitters; flow and backflow kits and accessories, such as diaphragm seals, manifolds and pressure limiting valves. Mid-West differential pressure gauges measure the difference between two points in a system and display the resulting pressure change on the gauge dial. They come with a glass-reinforced thermoplastic dial of 2.5 / 4.5 inches, an operating temperature range of -40 to 200 F and a differential pressure range of 0 - 100 psid. Raptor Supplies also offers a wide range of differential pressure gauges for measuring pressure drops across filters, strainers, separators, valves, pumps and chillers.

Things to Consider

Cross-Reference Alternatives

Mid-west Instrument MPNs cross individual references to the equivalent Dwyer model numbers for differential pressure gauges. So, if you're looking for a competitor item that is either out of stock or obsolete, chances are Raptor Supplies has the equivalent Mid-West products available.

Shipping

Mid-West thermometers and hydrometers have a small footprint and require compact packaging. Thus, these units can be delivered in a short period through courier shipment or air freight.

Major Trade Names

Mid-West Instrument Piston Gauges

These gauges allow process fluid to migrate across the piston from the high to the low side. They feature a precision ground floating piston / magnet in a diamond reamed bore against a calibrated spri...Read more 

Model 522C (3-colour dial) Rolling Diaphragm Differential Gauge

This gauge comes with a tri-colour dial (CLEAN / CHANGE / DIRTY) to quickly identify pressure drops across elements. It senses the differential pressure with the help of a flexible elastomer diaphragm...Read more 

Models 115 & 116 Tank Level Bellow Type Gauge

Model 115 and 116 comprise a two-piece body, bellows sensing element & over pressure assembly; a torque tube assembly, a spring and gauge front assembly. These gauges have rugged construction and a wa...Read more 

Midwest Instruments Competitive Advantages

5-Valve Backflow Test Kit

The backflow test kit is specifically designed for testing all reduced pressure principles, pressure vacuum / spill resistant breakers and double-check valve backflow prevention assemblies with an accuracy of +/-2 psid. This testing kit features soft-seated brass needle valves, a maximum operating temperature of 150 degrees F, an engineered plastic body and a maximum operating pressure of 200 psig. It comes with a durable moulded plastic case having storage compartments for tools and fittings. The kit is protected with 90-micron filters to eliminate plugging with scale or sand. It can perform all test procedures mentioned under ASSE, AWWA, CSA, FCCC & HR-USC and NEWWA.

Frequently Asked Questions

How often should the pressure gauge be calibrated?

The differential pressure gauge must be calibrated regularly (or on a prescribed date) to ensure the testing device can provide accurate readings.

What is the advantage of needle valves in the backflow test kit?

The needle valves restrict or allow flow by using a slender needle-shaped plunger. They regulate the flow of liquid or gas in metering applications.

What are differential pressure switches used for?

Mid-West differential pressure switches are supplied with reed switches or relays to initiate an alarm, activate the equipment or shut off the system.

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