What safety features does the Hand Lever Operated Hydraulic Spool Valve YFM55 include for high-pressure operation?

The Hand Lever Operated Hydraulic Spool Valve YFM55 includes several safety features designed for high-pressure operation: - Built-in type C safety (relief) valve preset to 140 bar to protect the system from overpressure by diverting excess flow when preset limits are reached. - Robust construction rated to a maximum working pressure of 315 bar, ensuring structural integrity under high-pressure loads. - Return line pressure capability up to 25 bar to maintain safe pressure levels in the return circuit. - Centering springs in the manual lever control for smooth, controlled neutral return and reduced risk of accidental or abrupt spool movement. - Durable cast iron body and hardened steel sliders to resist wear and prevent failure under repeated high-pressure cycles. - NBR seals providing reliable tightness across the operating temperature range (-20°C to +80°C), minimizing leakage risks that could compromise safety. Together these features offer overpressure protection, mechanical robustness, controlled manual operation, and reliable sealing for safe high-pressure use in demanding hydraulic applications.

How does the Hand Lever Operated Hydraulic Spool Valve YFM55 perform under continuous heavy-duty cycling and what maintenance intervals are recommended?

The Hand Lever Operated Hydraulic Spool Valve YFM55 is designed for continuous heavy-duty cycling and delivers reliable, consistent performance in such conditions. Its cast iron body and hardened steel sliders provide high wear resistance, while NBR seals maintain tightness under prolonged use. The built-in type C safety valve (preset to 140 bar) and type 1 sliders add protection and stable control during intensive operation. Rated to 315 bar working pressure, with return pressure up to 25 bar and an operating range of -20°C to +80°C, the YFM55 tolerates demanding environments and sustained cycles typical for cranes, lifts, construction and agricultural machinery. Recommended maintenance intervals (general guidance): - Daily/Before-use: visual inspection for external leaks, damaged seals, loose lever or mounting, and abnormal noises. - Every 250–500 operating hours: check and tighten connections, inspect slider wear and seal condition, verify safety valve setting and function. - Every 1,000–2,000 operating hours (or annually, whichever comes first): more thorough inspection—disassemble for internal inspection, replace worn sliders/seals, service safety valve and clean internal passages. - As-needed: immediate maintenance if performance drops, leaks appear, or safety valve actuates unusually. Actual intervals should be adjusted based on duty cycle intensity, fluid cleanliness, operating temperature, and manufacturer’s specific service recommendations.

Directional valve hydraulic spool, Controlled hand lever, type YFM55

All products, Directional control valves/

Additional information

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

A monoblock Directional valve spool YFM55 Controlled hand lever of centering springs. intended for systems hydraulic cranes, lifts, machine construction, agricultural etc. standard equipped in valve safety type C (set on 140 bar) and spools type 1. Material: cast iron (body), steel hardened (spools). sealing: NBR. maximum Working pressure: 315 bar. maximum pressure return: 25 bar. Operating temperature: od -20°C up to +80°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TL-YFM55-1-C-1	Directional valve hydraulic YFM55, 1-section with a valve overflow	-	315	In stock	Enquiry
TL-YFM55-2-C-11	Directional valve hydraulic YFM55, 2-section with a valve overflow	-	315	In stock	Enquiry
TL-YFM55-3-C-111	Directional valve hydraulic YFM55, 3-section with a valve overflow	-	315	In stock	Enquiry
TL-YFM55-4-C-1111	Directional valve hydraulic YFM55, 4-section with a valve overflow	-	315	In stock	Enquiry
TL-YFM55-5-C-11111	Directional valve hydraulic YFM55, 5-section with a valve overflow	-	315	In stock	Enquiry
TL-YFM55-6-C-111111	Directional valve hydraulic YFM55, 6-section with a valve overflow	-	315	In stock	Enquiry

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A monoblock Directional valve spool YFM55 Controlled hand lever of centering springs. intended for systems hydraulic cranes, lifts, machine construction, agricultural etc. standard equipped in valve safety type C (set on 140 bar) and spools type 1. Material: cast iron (body), steel hardened (spools). sealing: NBR. maximum Working pressure: 315 bar. maximum pressure return: 25 bar. Operating temperature: od -20°C up to +80°C.