MB -- GENERAL INFORMATION MB

The Brand MB, monoblock directional control valve, is a superbly designed monoblock spool valve suitable for applications requiring one valve to perform up to three separate functions. The MB valve is available in one (MB21), two (MB22) or three (MB23) spool configurations. The valve is also field convertible to closed center or power beyond with the appropriate cartridge.

SPOOLS – Tandem center 4-way (T, in model code) powers a cylinder or a motor in both directions. Open center 4-way (O, in model code) connects all ports to tank in neutral. Tandem center 3-way (T3, in model code) powers a cylinder in one direction. For more information, see the Spool Schematics.

SPOOL ACTIONS – Three-position detent (D, in model code) holds the spool in neutral and both active positions. Friction detent (F1, in model code) applies friction to the spool so the spool does not move when the handle is released; a detent groove clearly indicates neutral position. Spring-to-center (S, in model code) returns the handle to neutral when the handle is released. Spring detent (SD, in model code) springs back to neutral from PB (pushing the handle) and is held in detent while PA (pulling the handle) is engaged. Fourth position float (K, in model code) is similar to spring-to-center except it has a fourth position detent that makes all ports common to each other (used with tandem center spool only).

ACTUATORS – Standard joystick handle (A, in model code) is used to actuate two adjacent spools with one handle. Optional joystick handles (A1, A2 & A3, in model code) also actuate two adjacent spools with one handle, but have different actuation patterns (See Joystick Diagram). Enclosed lever handle (L, in model code) pressurizes the “B” port when the handle is pushed towards the valve body and is convertible from the vertical to the horizontal position. No actuator (N, in model code) is used when it is necessary to connect the spool to an external actuator.

OPTIONS – Power beyond (W, in model code) offers high pressure carryover for valves downstream. The MB valve is also field convertible to power beyond with the LV2-W power beyond cartridge kit. Closed center (C, in model code) blocks the neutral flow path and is required in pressure compensating, i.e. closed center systems. The MB valve is also field convertible to closed center with the LV2-C closed center cartridge kit. Adjustable relief (B, in model code) is factory preset at 2000psi (137 bar), but is adjustable from 1200 to 3100 psi (83 to 214 bar) and can be ordered in pressure intervals of 100 psi (6.9 bar). For pressure setting above the standard range, use spring P/N S064 for relief settings of 3100psi to 4000psi (214 to 276 bar). For pressure setting below the standard range, use spring P/N S065 for relief settings of 500psi to 1200psi (34 to 83 bar).

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