Other Components

-Introduction

-Basic Layout

-Additional Layout Options

-Soil-Water Relationship

-Product Selection Guide

-Spacing Between Dripperlines

-Length of Dripperlines

-Other Components

-Slopes

-Simplified Design

-Subsurface Systems

-System Monitoring

-Application Rates

-System Flow Rates

-How to Specify

-Technical Data

-Performance Specs

1. Filter

The purpose of the filter is to remove any impurities in the water supply before they enter the drip system. The filter is generally positioned directly downstream of the remote control valve. A Y-strainer or disc filter could be used and should be designed based on the flow requirements of the system and the minimum mesh size required by the DURA-FLO^TM PC Drip Emitters, (see Chart 9, page 21).

2. Automatic Flush Valve

This valve will be open at system start-up and shutdown, and automatically closes when the system is operating. Hence, sediment is flushed out twice during the irrigation cycle. Typically, the automatic flush valve is located at the furthest point from the water source.

3. Air/Vacuum Relief Valve

This device automatically controls air into and out of the system. On start-up air escapes through this valve to prevent air pockets. On shutdown if a vacuum starts to form, air is drawn into the system. By preventing a vacuum being formed in the system, debris will not be sucked into the drip emitter.
The air/vacuum relief valve should be installed at all the high points of the system.
If air pockets or vacuum formation are considered an issue, position the air/vacuum relief valve on a line interconnecting the DURA-FLO^TM PC dripperline. This could be a header or on an additional piece of plain tubing interconnecting the dripperlines.

4. Pressure Regulator

Where there is excessive pressure, (more pressure than is required per Chart 2, page 7), a pressure regulator should be installed directly downstream of the filter. The regulator maintains a pre-determined constant pressure in the system regardless of changes in the supply pressure. Select a pressure regulator according to the desired preset pressure and the flow requirements of the system.