AccuStream AccuValve On/Off Valve Manuel - Page 15

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AccuStream Cutting Systems

4.7 Replaceable Parts

Nozzle

The nozzle inner diameter wears from the top down. Nozzle life is a function of the orifice size used,

quantity and type of abrasive used, and operating pressure. In the A2 head, it is recommended to rotate

the nozzle 120 degrees each 8 hours of operation to even the wear on the inside of the nozzle. A list of

readily available nozzles, are given below:

Orifice

The most commonly used orifices are, made from either clear or red sapphire (ruby). Ruby orifices are

economical and can be used for a reasonable period providing the water quality is good. When a

sapphire or ruby orifice shows a bad stream it is usually caused by small microscopic chips at the hole

and it should be discarded and replaced. Using blown orifices may wear out the area of the abrasive

body where the abrasive mixes with the water stream. Diamond orifices are also available if longer life

is necessary. When diamond orifices give a bad stream they can often be fixed by cleaning them in an

ultrasonic cleaner.

Handling:

The diamond orifice assembly is held in a precision pilot cavity. Sometimes the diamond orifice may

stick inside the abrasive head. Stuck orifices can be removed from the head by blowing shop air in the

side abrasive inlet port.

Filtration:

The 12533 Thimble Filter in-line filter, (optional) is strongly recommended to protect the orifice from

larger particulates in the water. The assembly threads into the valve body just above the head and helps

to protect the orifice from any damage. If in-line filters are not used it is imperative that the high-

pressure lines be purged after any work on the pump or HP plumbing.

Clearing Plugged Nozzles

Plugged nozzles can be cleared by turning the nozzle upside down and carefully loading it up into the

head and turning the jet on and off.

Adapter (Nozzle Tube)

After repeated use, the bottom surface of the adapter where it seals against the orifice retainer may

become damaged. Applying AccuGoop to the top of the retainer will reduce or eliminate this problem.

Exterior abrasion

Repeated piercing can damage parts exposed to the bounce-back of the jet. A rubber shield that can

slide onto the nozzle can be used for protection. These rubber shields can be purchased from

Accustream or they can be cut out with the waterjet. There are two optional wear shields available. Part

number 11361 is a rubber only guard and 11362 has a carbide faceplate applied to the rubber shield for

extreme wear situations.

13084 ON/OFF VALVE & CUTTING HEAD MANUAL