Hydraulic directional control valves

  • Hydraulic directional control valves
Monoblock spool directional control valves controlled with a manual lever or solenoid with centring springs. Designed for the hydraulic systems of cranes, hoists, construction machinery, agricultural machinery, etc. Equipped with type C safety valve (set to 140 bar) and type 1 spools (for double-acting actuators) as standard.

Construction of a directional control valve

Construction of a directional control valve

Construction of a directional control valves

Hydraulic diagram

hydraulic diagram

  • number of ways: 4 (number of hose assemblies connected to ports in neutral position)
  • number of positions: 2 or 3 (number of squares adjacent to each other)
  • 0 (neutral position)
  • a, b (actuated position)
  • P (pressure/supply passage)
  • T (tank/return passage)
  • A, B (working passage)

Types of spools

Spool type
Type of control

type of control

Safety valve

A typeB typeC typeD type
without valve40 ÷ 80 [bar]63 ÷ 200 [bar]160 ÷ 315 [bar]

Selection of multi-section directional control valve

During selection consider the following criteria:

  • number of sections (1, 2, 3, …)
  • size of thread connections
  • type of spool (for each section)
  • type of control (for each section)
  • working pressure
  • flow rate
  • additional requirements (e.g. lock)

Types of directional control valves

Type of directional control valveNominal flow rateMax. working pressure (passage A, B, P)Max. return pressure (passage T)Max. number of working sectionsConnection sizeControl
YFM3545 l/min315 [bar]25 [bar]63/8” BSPlevers
YFM5560 l/min315 [bar]25 [bar]61/2″ BSPlevers
YE4545 l/min250 [bar]25 [bar]63/8” BSP12V DC

 

Power beyond function

Power beyond – the directional control valves above are equipped with an adapter which, when fitted inside the body, enables operation with a power beyond function. The adapter blocks the direct connection of the pressure passage (P) to the return passage (T). Unused pressurised oil is thus diverted elsewhere in the hydraulic system to feed additional elements.

normal operationoperation with power beyond function
rozdzielacz_hydrauliczny_schemat1rozdzielacz hydrauliczny 2 sekcyjny
 rozdzielacz hydrauliczny 3 sekcyjnyrozdzielacz hydrauliczny 4 sekcyjny

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List of products:

3-way hand switching valves

3-way hand switching valves

hydraulic directional control valves; hand lever operated

Hydraulic directional control valves; hand lever operated

Hydraulic directional control valves; electrically operated

Hydraulic directional control valves; electrically operated

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