///Water leaks from the on/off valve body or weep hole
On/off valve

Water leaks from the on/off valve body or weep hole

Water at the valve body comes from the valve seals.

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 first 0 of 2 checked
01Worn valve seal assembly Most likely

The stem seal lets water reach the actuator side.

How to check: Water between valve body and actuator.

PhotoArt. no.DescriptionReplaces OEMExcl. VAT
10002 Back-up ring, Pneumatic Valve, 10188233
Back-up ringKMT, Techni
KMT 10188233 € 13.20
10003 Bearing Disk, Pneumatic Valve, 10187250
Bushing & ringKMT, Techni
KMT 10187250 € 15.60
10022 Seal assembly 0,25", Pneumatic Valve, 10178978
AssemblyKMT, WSI
KMT 10178978 · KMT 20428052 € 17.59
10717 Seal assembly, Pneumatic valve, 1/4", UHP, 72112069
AssemblyKMT
KMT 72112069 · KMT 20474158 € 24.06
10727 Seal assembly 0,25", Pneumatic Valve, 20428052
AssemblyKMT, Techni
KMT 20428052 € 17.18

02Gland or nozzle nut not at torque Less likely

A loose nut leaks at the seat faces.

How to check: Torque with pressure released.

Related problems

General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .