What are the optimal maintenance intervals for the Hand‑Lever Operated Hydraulic Spool Valve YFM120 to ensure reliable operation and longevity?

Recommended maintenance intervals for the Hand‑Lever Operated Hydraulic Spool Valve YFM120 to ensure reliable operation and longevity: - Daily / Before each use: - Visual inspection for external damage, leaks at ports and body, loose mounting fasteners, and proper lever movement/centering. - Check hydraulic fluid level and cleanliness in the system. - Weekly: - Operate each spool through full travel to confirm smooth action and return to center. - Inspect external seals and hose connections for seepage or deterioration. - Monthly (or every 100 operating hours): - Clean valve exterior and lever pivots; remove dirt and debris that can accelerate wear. - Check mounting torque and retighten fasteners if required. - Verify safety valve setting (factory-set 180 bar) for correct operation using calibrated test equipment if system conditions suggest possible drift. - Quarterly (or every 500 operating hours): - Inspect sliders and internal surfaces for wear or scoring if system contamination suspected; consider borescope inspection if available. - Check return line pressure (should be ≤50 bar) and overall system pressure (max working 250 bar) to ensure no abnormal loads. - Replace external seals or O‑rings showing signs of aging (NBR seals are durable but degrade with contamination, heat or ozone). - Annually (or every 2000 operating hours): - Full service: remove valve for detailed inspection of cast iron body, hardened steel sliders and NBR seals; replace seals as preventive maintenance. - Test safety valve and recalibrate if necessary. - Inspect system fluid (contamination, viscosity, water content) and replace/filter fluid if outside recommended specifications. - Condition‑based actions: - Immediately service if abnormal noise, sticking, excessive leakage, loss of centering, or pressure excursions occur. - Shorten intervals in harsh environments (high contamination, extremes of temperature beyond −20°C/+80°C, heavy duty cycles). Follow manufacturer’s detailed service manual and use compatible hydraulic fluid and replacement NBR seals to preserve performance and longevity.

How does the factory-set 180 bar safety valve on the Hand‑Lever Operated Hydraulic Spool Valve YFM120 affect system integration and required system pressure settings?

The factory-set 180 bar safety valve on the Hand‑Lever Operated Hydraulic Spool Valve YFM120 acts as a built-in pressure limiter that directly affects how the valve integrates into a hydraulic system and what system pressure settings are required: - Overpressure protection: It prevents system pressure from exceeding 180 bar at the valve, protecting actuators, lines and components downstream from the spool valve even though the valve’s absolute max working pressure is 250 bar. - System pressure setting: Upstream pump relief or system main relief should be coordinated with the 180 bar setting. If the system relief is set higher than 180 bar, the YFM120’s internal valve will open first; ideally set system relief slightly above or equal to safe working setpoints while ensuring cumulative circuit protection and avoiding conflicting valve operations. - Integration considerations: When used in multi-valve banks or parallel circuits, confirm that other reliefs and accumulators are matched so the YFM120’s 180 bar threshold does not cause unintended flow diversion or nuisance dumping. In applications requiring higher operating pressure for specific functions, either select a valve variant with a different factory setting or rework protection strategy (external relief coordination). - Safety margin and commissioning: Leave margins for pressure spikes and temperature effects; verify actual opening with pressure gauge during commissioning. Ensure return-line and component ratings (return up to 50 bar) are respected. - Practical effect: In normal use the YFM120 will limit maximum working pressure experienced at its spool to ~180 bar, providing reliable protection and simplifying local circuit safety, but requiring coordinated system-level relief settings for correct overall behavior.

Directional valve hydraulic spool, Controlled hand lever, type YFM120

All products, Directional control valves/

Additional information

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

A monoblock Directional valve spool YFM120 Controlled levers manual of centering springs. intended for systems hydraulic cranes, lifts, machine construction, agricultural, etc. standard equipped in valve safety (set factory on 180 bar) and spools type 1. Material: cast iron (body), hardened steel (spools). sealing: NBR. maximum Working pressure: 250 bar. maximum pressure return: 50 bar. Operating temperature: od -20°C up to +80°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Price	Quantity	Actions	Catalogue
TL-YFM120-1-C-1	Directional valve hydraulic YFM120, 1-section with a valve overflow	-	250	In stock	0 €		Enquiry
TL-YFM120-2-C-11	Directional valve hydraulic YFM120, 2-section with a valve overflow	-	250	In stock	0 €		Enquiry

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A monoblock Directional valve spool YFM120 Controlled levers manual of centering springs. intended for systems hydraulic cranes, lifts, machine construction, agricultural, etc. standard equipped in valve safety (set factory on 180 bar) and spools type 1. Material: cast iron (body), hardened steel (spools). sealing: NBR. maximum Working pressure: 250 bar. maximum pressure return: 50 bar. Operating temperature: od -20°C up to +80°C.