The Allen-Bradley 836T-D451J controller is an industrial pressure difference controller. It is part of the Allen-Bradley/Rockwell Automation 836 Pressure Controls series and it is a member of the 836T line of pressure difference controllers. The 836T-D451J pressure difference controller is a Style D controller that fits with a 2-circuit contact block and it comes with a Type 1, 4, or 13 enclosure for protection. The bellows in this controller are made of copper alloy. The 836T-D451J pressure difference controller can tolerate up to 80 PSI of line pressure and up to 90 PSI of occasional surge pressure during operation. The adjustable system difference range for the 836T-D451J pressure difference controller is from 1 to 9 PSI while the adjustable differential mid-range values range is from 1 to 7 PSI.

The Allen-Bradley 836T-D451J pressure difference controller is a compact controller that weighs about 4 pounds. Its most common applications include air compressor applications, compactor ram applications, lubricant and coolant pressure control applications, material clamping applications, machine hydraulic system applications, and machine tool applications. The 836T-D451J pressure difference controller can be customized for different applications with a variety of accessories from the 836 Pressure Controls series. This device can detect when a machine or gasses and liquids in a system are experiencing excessively high pressure levels to prevent the machines from wearing out, rupturing, or even exploding. The 836T-D451J pressure difference controller can also detect when the pressure level in a system is too low, because excessively low pressure can cause a device to lose or be unable to use its lubricants or coolants.