What maintenance is required for the Hydraulic spool valve, operated by hand lever, type YFM80 to ensure the centering springs and safety valve (set 180 bar) remain reliable?

For the Hydraulic spool valve, operated by hand lever, type YFM80, perform the following maintenance to keep centering springs and the factory-set safety valve (180 bar) reliable: - Regular inspection: visually check lever action and centering after each shift cycle or daily in heavy use. Ensure smooth, positive return to neutral indicating springs intact. - Functional test: monthly operate each spool through full travel and verify centering. Measure system pressure during operation and confirm safety valve holds at ~180 bar with a calibrated gauge; test under load quarterly or per operating hours. - Cleanliness: keep valve and surrounding area free of dirt and debris. Contaminants cause wear of sliders and can impair spring seating and valve accuracy. Replace hydraulic fluid and filters per machine manufacturerâs schedule; monitor fluid cleanliness (ISO cleanliness codes). - Fasteners and seals: monthly check body fasteners and external seals (NBR) for leaks or damage. Leaks can change return pressures and stress springs. - Spring condition: during annual service, disassemble the spool section to inspect centering springs for corrosion, cracking, loss of elasticity or seating damage; replace springs showing any wear or fatigue. - Safety valve service: at least annually or after any overpressure event, remove and bench-test the safety valve set to 180 bar; clean or replace internal parts if drifting beyond tolerance. Use only calibrated test equipment and follow torque/specs for reassembly. - Operating limits: avoid exceeding max working pressure 250 bar and max return pressure 50 bar; operate within temperature range (-20Â°C to +80Â°C) to prevent material and spring fatigue. - Record keeping: log inspections, test results, replacements and any pressure adjustments. Following this schedule maintains reliable centering springs and the 180 bar safety valve in the Hydraulic spool valve, operated by hand lever, type YFM80.

How often should the Hydraulic spool valve, operated by hand lever, type YFM80 undergo inspection and testing of its centering springs and safety valve (180 bar)?

For the Hydraulic spool valve, operated by hand lever, type YFM80, inspect centering springs and safety valve (factory set to 180 bar) at initial commissioning, after any repair or shock load, and then as part of routine maintenance: visual/function check every 3 months and full functional/testing (including pressure test of the 180 bar safety valve and spring performance) every 12 months. Increase inspection frequency to every 3â6 months in severe service (continuous operation, heavy vibration, high contamination, or wide temperature cycling). Immediately test/replace if drift, spongy lever feel, leaks, or pressure abnormalities occur. Records of tests and settings should be kept.

How can I verify proper operation of the centering springs and 180 bar safety valve on the Hydraulic spool valve, operated by hand lever, type YFM80?

To verify proper operation of the centering springs and the 180 bar safety valve on the Hydraulic spool valve, operated by hand lever, type YFM80, perform the following checks: 1. Visual and mechanical inspection - Ensure valve is clean, free of external damage and correctly mounted. - Check hand lever travel: from neutral move through full stroke to each working position and release. Lever should return smoothly and consistently to neutral under its own forceâthis confirms centering springs are functional. - Check for binding, uneven resistance or lateral play in lever/slider; any roughness suggests spring damage, slider wear or contamination. 2. Centering springs functional test - With system depressurized, operate the lever several times and observe return to center. Note time and smoothnessâreturn should be steady and without hesitation. - With system pressurized to normal operating pressure (below safety valve setting), repeat lever operation under load. Centering must still occur reliably; if spool sticks in a position or returns slowly under load, springs, spool or internal sealing may be faulty. - Measure return force if precise verification required: compare measured spring return torque/force to manufacturer specification (if available). Significant deviation indicates weakened springs. 3. Safety valve (factory set to 180 bar) verification - Connect a calibrated pressure gauge or test bench to the valve inlet per safe test procedures. - Slowly increase system pressure while monitoring gauge. Safety valve should begin to relieve near 180 bar and stabilize pressure close to that setpoint. Note pop-in and reseating behavior. - Confirm the valve holds pressure below setpoint and relieves cleanly without sustained oscillation or leakage at pressures above 180 bar. - After relief, reduce pressure and verify valve reseats and permits normal operation without sticking. - Ensure maximum working pressure (250 bar) and return limits (50 bar) are not exceeded during testing. 4. Leak and performance checks - With valve cycling, inspect for external leaks at body, connections and spool seals. - Verify actuated ports supply and return flow correctly when lever is operated; abnormal flow or sluggish movement under normal pressure may indicate internal issues. 5. Safety and documentation - Perform tests with appropriate safety precautions and equipment. If results deviate (springs weak, spool sticky, relief not opening at ~180 bar or not reseating), repair or replace components. - Record test readings and observations for maintenance records. Following these steps will confirm whether the centering springs and the 180 bar safety valve of the Hydraulic spool valve, operated by hand lever, type YFM80 are functioning properly.

Directional valve hydraulic spool, pilot-operated hand lever, type YFM80

All products, Directional control valves/

Additional information

Maximum operating temperature [°C]	80
Minimum operating temperature [°C]	-20

A monoblock Directional valve spool YFM80 pilot-operated levers manual of centering springs. Intended for hydraulic systems of cranes, lifts, construction and agricultural machinery, etc.. As standard, equipped with a safety valve (factory-set to 180 bar) and type 1 spools. Material: cast iron (body), hardened steel (spools). Sealing: NBR. Maximum working pressure: 250 bar. Maximum return pressure: 50 bar. Operating temperature: from -20°C to +80°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TL-YFM80-1-C-1	Hydraulic directional valve YFM80, 1-section with a valve overflow	-	250	In stock	Enquiry
TL-YFM80-2-C-11	Hydraulic directional valve YFM80, 2-section with a valve overflow	-	250	In stock	Enquiry
TL-YFM80-3-C-111	Hydraulic directional valve YFM80, 3-section with a valve overflow	-	250	In stock	Enquiry
TL-YFM80-4-C-1111	Hydraulic directional valve YFM80, 4-section with a valve overflow	-	250	In stock	Enquiry
TL-YFM80-5-C-11111	Hydraulic directional valve YFM80, 5-section with a valve overflow	-	250	In stock	Enquiry
TL-YFM80-6-C-111111	Hydraulic directional valve YFM80, 6-section with a valve overflow	-	250	In stock	Enquiry

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A monoblock Directional valve spool YFM80 pilot-operated levers manual of centering springs. Intended for hydraulic systems of cranes, lifts, construction and agricultural machinery, etc.. As standard, equipped with a safety valve (factory-set to 180 bar) and type 1 spools. Material: cast iron (body), hardened steel (spools). Sealing: NBR. Maximum working pressure: 250 bar. Maximum return pressure: 50 bar. Operating temperature: from -20°C to +80°C.