Introduction to Air Logic
The Air Logic Division of Fred Knapp Engraving Company specializes in pneumatic and vacuum control equipment, offering products like sensing elements, control elements, output devices, and air supply systems. Their control elements include fluidic and diaphragm components for specific applications.

Product Overview
Air Logic provides pneumatic accessories for various applications, including Check Valves, Orifice Restrictors, Filtered Orifice Restrictors, Needle Valves, Inline Filters, and Preset Flow Controls.

Check Valves
These miniature valves allow unidirectional flow with low cracking pressure and high repeatability, using a disc mechanism.

Orifice Restrictors
Available in three models, these are precision molded from polysulfone for inline or flexible tubing installation.

Filtered Orifice Restrictors
Combining an orifice restrictor and a stainless steel filter, these devices protect against contaminants.

Needle Valves
These valves offer precise flow control with fine threads and are available in different materials and o-ring options.

Inline Filters
Constructed from polysulfone and stainless steel, these filters are designed for low pressure drop and come in various micron sizes.

Preset Flow Controls
These controls maintain constant flow in one direction and full flow in the opposite direction using a disc mechanism.

Specifications and Materials
Detailed specifications include maximum pressure, operating temperature, recommended filtration, and construction materials.

Ordering Information
Each product section provides model numbers, orifice diameters, and accessory requirements for port connections.

F-2804 Series Check Valves
These valves allow unidirectional flow, with five models available, featuring low cracking pressure and minimal forward flow restriction.

Specifications
Flow characteristics are provided for each model at different pressure differentials.

Ordering Information
Models are color-coded and available with specific port connections, with accessories specified by letters.

Warranty
Products are warranted against defects for one year, with replacement or refund available if defects are reported within 30 days.

Disclaimer
All other warranties are disclaimed, limiting liability to the contract price and excluding consequential damages.

Warnings
Users should not exceed rated operating conditions and should check material compatibility to prevent failure.

Contact Information
Fred Knapp Engraving Co., Inc. is located in Racine, Wisconsin, with contact details provided for inquiries.