Using pipe sealant compound, tighten PVC Slip X MIP adapters into the inlet and outlet shutoff valves on the assembly. Position the assembly on the riser so that the bonnet is on top. Turn the assembly so that later shelter cover can be installed in the most visually satisfactory position. Glue the inlet adapter onto the riser working quickly to avoid damaging internal parts.

Pressure vacuum breakerfor sprinkler system

Separate the second union, apply thread sealant compound to the threads, and reconnect hand tight. Glue the union onto the downturned supply pipe.

What is apressure vacuum breakerused for

Every backflow prevention device comes with written specifications, instructions, and part numbers. Upon installation this should be put in a safe place. It will be needed to make repairs. If it has been lost, obtain a copy from the supplier or search for one online. Local code will determine who can test and repair the backflow prevention device. In most cases, if the homeowner is allowed to test and repair, an inspection by a state-certified blowout prevention inspector will be required before the unit is put back into service. Before opening the pressure vacuum breaker assembly, close the isolation valve, the outlet shutoff valve, and the inlet shutoff valve in that order. Open test cock #2 to release pressure. Then remove the assembly cover. One common cause of pressure vacuum breaker malfunction is debris in the system, particularly the poppet or check assembly. To clear debris, remove the bonnet screw, the bonnet assembly, and the poppet assembly. Look for debris--bits of grass, grains of sand, etc. If any is found, rinse parts, reassemble, and test. Otherwise, remove the retainer and check assembly. Keep parts organized and out of the turf. Again check for signs of debris. Partially open the isolation valve and then partially open the inlet shutoff valve to flush any debris from the line. Close the valves and rinse all parts with clean water only. Inspect each part for visible damage and replace as necessary. Reassemble in reverse order and test. When the assembly seems to be working properly again, close the isolation valve and arrange for inspection if required before putting the irrigation system back in service.

Pressure vacuum breakerleaking from top

Cut the riser again four inches from the top, insert the union between the two pieces and glue it into place. Glue a Slip X MIP adapter to the top of the riser. Allow to cool. Separate the union, apply thread sealant compound, and tighten with a wrench.

Apply pipe sealant compound to the male adapter threads, then connect the inlet shutoff valve on the pressure vacuum breaker assembly to the riser so that the inlet is at the bottom and the bonnet is at the top. Loosen the union if necessary and turn the assembly so that later the cover can be installed in the most visually satisfactory position.

JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Glue an elbow, plumb and pointed downward, onto the supply line where it exits the assembly. Glue another four-inch pipe into the elbow.

Pressure Vacuum BreakerParts

The irrigation system site plan will indicate the location of the pressure vacuum breaker assembly. It should be as close as possible to the isolation valve and within a few inches of a trench leading to the zone control valves. Before installing the pressure vacuum breaker assembly, run the supply pipe to the location of the assembly in accordance with the site plan and, if necessary, use an elbow to turn the supply line vertical and upward. Glue a long riser into the elbow. This riser will be cut to the correct height in the next step. Determine the minimum installation height. Find the highest outlet on the system. In a relatively flat landscape, this is likely to be at the top of a shrub watering riser or sprinkler head. It may be necessary to drive a stake where the riser will be and mark the height of the outlet. Use a laser or string level to find and mark this height on the pressure vacuum breaker assembly riser. On the pressure vacuum breaker assembly riser, measure up twelve inches and place a second mark. If the riser isn't tall enough, extend it with a coupling. This mark represents the height of the vertical center of the outlet valve. To get the assembly installed at this height:

Multi-station gauge isolators are available in six different versionsThese differ mainly in the number of measurement points- MS2: 6 measurement points- MS4: 6 measurement points, although one additional tank connection in order to relieve the MS4 after the reading (emptying proceeds automatically after the pressure is read)- MS5: 5 measurement points with additional 0-position for relief- MS6: 9 measurement points also with additional tank connection (same as MS4)- MS7: 8 measurement points also with additional 0-position for relief (same as MS5)

Tighten an FIP hose bib onto the riser using thread sealant compound. This hose bib will be necessary to drain the system for winterization or repair.

The only standard yearly maintenance procedure for a pressure vacuum breaker assembly is the annual system winterization routine. Even if the PBVA has a freeze protection relief valve, the system must be completely drained. The specific procedure for draining the system will depend on site factors such as slopes, water source, and drain valve locations. Once the system is drained, test cocks on the PVBA should be left halfway open. In many jurisdictions an inspection will be required when the system is reactivated in the spring. Every five years all non-metallic internal components should be replaced. SprinklerWarehouse.com has all the necessary parts in stock.

Open the isolation valve to flush foreign material from the supply line, close the valve, and dry the adapter. If water stands in the riser, loosen the union to drain, then retighten.

Replacing the entire pressure vacuum breaker assembly with a new one is a fairly simple process. Disconnect the assembly section at the unions, and duplicate the section using a new assembly, pipe, and fittings. Then reconnect, test for leaks, and call for inspection. It must be noted, though, that once the entire original pressure vacuum breaker assembly is discarded, any “grandfather” protection is probably lost. If pressure vacuum breaker assemblies have been proscribed locally since it was installed, it may have to be replaced with a new double check valve assembly or reduced pressure assembly. Check with local authorities before replacing the entire assembly.

pressure vacuum breaker- how it works

Pressure vacuum breakerdiagram

Multi-station gauge isolators type MS are designed to check up to 9 different pressures in a hydraulic system. Each individual measurement point can be selected by turning the rotary knob.

Measure, cut, and glue a length of pipe long enough to extend four inches above the ground into vertical opening in the tee and then glue a male adapter on top. Allow to dry.

Pressure Vacuum BreakerAssembly

Measure the length of the union body not including connection hubs. Measure down from the third mark and place a fourth mark. Cut on the fourth mark to achieve minimum installation height.

Line up the pressure vacuum breaker assembly so that the outlet is centered at the height of the second mark and the inlet is downward. Place a third mark on the riser at the bottom of the pressure vacuum breaker assembly inlet valve. Cut the riser on the third mark.

Pressure vacuum breakerinstallation

Glue a random short length of pipe (at least six inches) and then a Slip cap into the downstream lateral opening of the tee. Later this cap will be cut off to continue installing downstream supply pipe.

HYDAC International is a world leader in motion control and fluid technology, operating in over 50 countries with more than 9,500 employees and 500 sales and service partners worldwide.

Glue an elbow, a six-inch length of pipe, and then a riser tee with a half-inch outlet (usually a 1 X 1 X 1/2 tee) onto the supply line.

This installation can be done using copper pipe and fittings if the homeowner has the soldering equipment and skill. Otherwise, PVC installed as described above is legal and adequate in most jurisdictions. If copper pipe and fittings are used, transition to plastic after the hose bib. Copper provides no advantages beyond this point.

Glue a short length of pipe, about four inches, into the second Slip X MIP adapter. Using pipe sealant compound, tighten the adapter into the outlet shutoff valve on the assembly.

Cut a three to four inch length of PVC. Glue an elbow onto one end, and then glue the other end into the outlet adapter so that the elbow is pointed downward. Measure, cut, and glue a length of pipe long enough to extend from the elbow to three inches above the bottom of the trench. Skip the following instructions for installing unions.

Open the isolation valve to flush out any foreign material in the supply line. Close the isolation valve, and dry the end of the pipe. Use a towel to wick water down if necessary so that the top few inches are empty and dry.