Freeze Protection, Back Flow Prevention, Gauges
 Catalog Page 59

This flush valve opens when line pressure drops below 2.5 PSI.   It can be installed at the end of a drip line using a CE or an ELMH or at a low point in the middle of a line using a CMT or an ELMT.
When installed on the bottom of the filter it serves to automatically flush sediment from it. When installing drippers or sprayers in hanging baskets it is a good idea to install a flush valve into the vertical feed line a foot or so below the horizontal feed line. This will prevent prolonged dripping into the baskets.

For underground sprinkler systems using PVC or stiffer poly pipe, simply install a Drain Valve at all low points in the system.   Has 1/2" male pipe threads so it must be used with a fitting having 1/2" female pipe threads.   Opens when the line pressure drops below 3 PSI.

When installing an underground system there is usually a problem with the back suction of dirt particles when the system shuts off.   This can be solved by inserting Air Bleed Valves at high points in the system.   Also used at the high point in a gravity fed system to prevent air locks.
To install in a 1/2" mainline, use an EL12FT fitting

Most newer homes have brass back flow preventers on every outside faucet.   Use when fertilizer is injected into a system.   Can reduce water flow by 20-30%.

A one way valve that will keep water in a drip system from flowing back into your home water supply if there is a sudden loss of pressure.   Check valves are commonly used in pump systems to eliminate back pressure on the pump.   PVC body with a 1/2 pound spring. Able to handle up to 200psi static pressure.

Use a vacuum breaker when fertilizer is injected into a system to prevent contamination of your water supply.   Most cities require them at the start of any system whether fertilizer injection is used or not.   If in doubt, call your local building inspector.

The brass double check valve from Febco (3/4" unit) or Wilkins (1" unit) is the ultimate in backflow protection. It will meet building codes anywhere. This unit has two independent check valves for failsafe operation.

Find out what your pressure really is!   These gauges have hose swivel adapters to hook up to a faucet, the end of a hose or in-line in a drip system.   For an in-line set-up, you will need a Male Hose Tee, CMT or SPMT.   For end of line set-up use a Male Hose End, CE or SMLMH.   When not using the gauge, cap off the tee or hose end with a hose cap, HCAP.

This nifty gauge will let you see both your water flow and your water pressure. Water pressure can be measured up to 160 PSI. Water flow can be measured up to 13 GPM (or 780 GPH). This gauge helps you determine the water capacity an limitations that directly impact the design and performance of your drip irrigation system.
No landscaper should be without it!