Magnet-20493661.1499.3-1

Short Description:

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Details

Product Name: Magnet (Part No. 20493661)

Description:
This component is a magnet, specifically designed as the actuation target for the proximity switch (piston position sensor) in waterjet intensifier pumps. As the hydraulic piston reciprocates within the cylinder, this magnet travels with the piston assembly and passes in front of the proximity switch sensor . The sensor detects the magnetic field, generating an electrical signal that tells the control system it is time to reverse the hydraulic flow, thus continuing the pressure cycle.

This magnet is a critical component in the pump‘s electronic control loop. It is typically a permanent magnet housed within the piston or securely attached to the moving assembly. Its robust construction is designed to withstand the high vibration, extreme pressure cycling, and hydraulic fluid environment inside the intensifier pump, ensuring reliable, long-term operation without demagnetization or physical degradation.

Applications:

Acts as the moving target for the intensifier pump’s proximity switch (Hall effect sensor) .
Provides the magnetic field necessary for the control system to detect the piston‘s end-of-stroke position.
Triggers the signal that reverses the directional control valve, sustaining the pump’s reciprocating action.
Used in 60,000-94,000 PSI (approximately 4,137-6,480 bar) waterjet intensifier systems.

Features:

High-Strength Permanent Magnet: Engineered to maintain magnetic field strength over millions of cycles without significant degradation.
Durable Housing: Constructed to withstand the harsh conditions inside the hydraulic cylinder, including exposure to high-pressure hydraulic fluid and mechanical shock.
Critical Timing Component: Ensures accurate shift timing for stable, consistent pump operation and pressure output.
Direct OEM Replacement: A standard component in intensifier proximity switch assemblies for major waterjet systems.

Maintenance:

Failure Diagnosis (When to Replace):

Pump Fails to Shift: The intensifier piston stops at the end of its stroke and does not reverse direction. This is the primary symptom of a missing, damaged, or demagnetized magnet .
Erratic or Inconsistent Shifting: The pump cycles irregularly, shows “double stroking,” or the shift timing is inconsistent.
No Sensor Response: While troubleshooting a “no shift” condition with a known good proximity switch, the sensor does not activate when the piston is manually moved past the sensing zone.
Physical Damage: During pump overhaul, if the magnet housing is cracked, corroded, or the magnet itself is broken.

Inspection and Replacement Guidelines:

Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system (high-pressure water and hydraulic circuits), disconnect electrical power, and follow lockout/tagout procedures .
Access: The magnet is typically accessed by removing the proximity switch and then the access port on the hydraulic cylinder or by disassembling the end bell.
Inspection: If the intensifier is disassembled for seal replacement or other major service, visually inspect the magnet for cracks, corrosion, or any loss of material.
Replacement Criteria: There is no fixed service interval for the magnet itself. Replace it immediately if it shows any signs of physical damage or if the pump fails to shift after confirming the proximity switch is functioning correctly.
Installation: Ensure the magnet is correctly oriented and fully seated in its mounting position. The correct air gap between the magnet and the proximity switch sensor is critical (usually 1-3mm). Consult the equipment service manual for the precise specification.
Sensor Test (Differentiation): To determine if the fault is the magnet or the sensor, you can sometimes swap the left and right proximity sensors. If the problem stays on the same side, the magnet is likely the issue. If the problem moves to the other side, the sensor is faulty .