Orifice Failure Modes in Watejet Application_Chonghong Industries(Microwork) Ltd.

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Chonghong Industries(Microwork)Ltd.
1803,2006,Huachuang Intl Commerce Building

Honghuang 10th Road Jiangbei District

Chongqing China 400020

Tel: (0086-023) 67937146
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Orifice Failure Modes in Watejet Application

1. MOST COMMON FAILURE DUE TO IMPACTS FROM

Debris from the material being cut, which has been sucked through the orifice in the vacuum created when turning the jet off.
Metal or plastic particles from High-Pressure tubing and filters.
Garnet particles pulled back through the jewel’s orifice via the vacuum created when the stream is cycled off.
High-Pressure seal particles.Other line-born contaminants.

2.FAILURE DUE TO OVAL SHAPED THROUGH HOLES

A faulty manufacturing process causes oval-shaped or not-round orifice. This type of error will then negatively affect jet stream coherency and render it unusable. When this
failure happens, you will see a fluctuating jet stream that frequently alternates from coherent to turbulent and may also hear spitting and sputtering sounds while this occurs.

3. FAILURE TO SEAL

When machining an orifice mount, it is very important to leave concentric machine lines. If the machine line is not concentric, the jewel is unable to seat properly in the mount and therefore will not seal. And water as well as foreign debris is able to pass around the jewel and cause immediate orifice failure. With this type of failure mode, it is typical to see a jet stream that fluctuates frequently from coherent to turbulent.

4. FAILURE DUE TO POOR WATER QUALITY

There are two kinds of water contaminates that will cause failure. Dissolved solids and suspended solids in water can impact the edge of the orifice and in extreme cases chip it causing orifice failure. Especially those operating under extreme heat, solids that are dissolved can collect onto the entrance of the orifice, a ring of the precipitate can build up around the orifice. and finally, the ring may break, damage the orifice and disrupt jet quality causing orifice failure.

5. ORIFICE RETAINER FAILURE

An inappropriate retaining method and material will blow out orifices(angled jet streams and fractured jewels)this mostly happens in high amounts of on/off cycles. At this moment the orifice is susceptible to particles that may become wedged between the orifice and the seat, which will permanently dislodge the jewel and cause failure.

6. FAILURE DUE TO OVER TORQUE

When an orifice assembly is over torqued, deforming, marring, gouging of the mount and in extreme cases, the fracturing of the jewel can occur, all of which cause or lead to premature orifice failure or inefficient jet stream quality.

submitted on April.26.2021