///Loud knocking from the check valve when the pump strokes
Intensifier: high-pressure side
Loud knocking from the check valve when the pump strokes
A loud knock at stroke change can come from a worn outlet seat or a sticking poppet.
Safety first: Switch off the pump, release all pressure (open the on/off valve or bleed-down valve) and lock out before you open any high-pressure part. Never put a hand or tool near a running jet.
1Check the causes, most likely first0 of 2 checked
01Worn outlet seat with lipMost likely
A worn seat forms a lip that makes the poppet open late and hard.
How to check: Inspect the outlet seat for a step or lip.
How to check: Check spring and guide when the valve is apart.
Related problems
General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .
Cutting heads
These heads look the same from the outside; the inside differs. Choose your machine brand, then the head and the orifice size.
Which machine brand do you have?
Mounted orifices
Pick the mount of your cutting head, how you cut, the jewel material and the bore. Bores follow the inch standard; mm shown for reference.
1 · Mount type
2 · Material
3 · Bore size
Compare all sizes and prices
All sizes
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Focusing tubes
Also called mixing tubes. Enter the size printed on your old tube, or choose your machine brand and tube type.
ROCTEC® focusing tubesROCTEC® is a composite carbide made for abrasive waterjet focusing tubes. ROCTEC® 100 is the standard grade; ROCTEC® 500 is the premium grade, made for a longer service life.
Which machine brand do you have?
HP tubing, cut to your length
Autofrettaged high-pressure tubing. Choose size, pressure rating and length. We cut, cone and thread it for you.
1 · Outer diameter
2 · Pressure rating
cm
10 – 600 cm, measured end to end including the cones.
4 · Coning & thread
Your tube
Cut, coned and threaded to order. Bent tubes for specific machines are sold as separate parts.
