Emerson 788 DVC Danieltm Model 788DVC Digital Control Valves Introduction, Aggressive Products

DANIELTM MODEL 788DVC DIGITAL CONTROL VALVES D E C 2012

1.0INTRODUCTION

The DanielTM Model 788DVC Digital Control Valve is a solenoid operated device designed to provide precise flow rate control and batch delivery of liquid products. It is used in conjunction with an electronic batch control device such as the Daniel DL8000. The Model 788DVC valve is automatically controlled by the DanLoad for low flow start-up, high flow rate control, low flow shut-down, and final shut-off. It also provides for maximum flow meter accuracy by maintaining a constant flow rate in applications with varying line pressure. The Model 788DVC features an external pilot control loop that consists of a normally open solenoid pilot, a normally closed solenoid pilot, strainer and opening/closing speed controls.

1.1Aggressive Products

Some Daniel control valves have been equipped with an “AP” (Aggressive Products) cylinder assembly. This cylinder assembly may be supplied as a direct replacement for existing units or may be supplied with the original order. It is designed for all Daniel 2", 3", 4" and 6", 150/300 lb. ANSI, Series 700 Valves. Spring-loaded Teflon® cup-seals are utilized on the main body piston and low swell Nitrile O-rings in static positions. For specific instructions for receipt, installation and maintenance of Control Valves containing the “AP” Cylinder Assembly reference manual 3-9008-

554.Also contained within this manual are complete instructions for retrofitting existing standard valves with the “AP” Option package.

If you have questions or need information not contained in this manual, please contact your Daniel sales representative or the Daniel Measurement and Control service center nearest you.

INTRODUCTION 1-1