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AO755 Series 1-Spool Monoblock Valve, 4-way 3-position, Closed Center Detented Spool

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Description & Features

The AO755 Series 1-Spool Monoblock Valve 4-way 3-position Closed Center Detented Spool is engineered for precise control in industrial applications. Featuring a compact cast iron body this valve ensures durability and long service life under maximum operating pressures of up to 3000 PSI.

This valve boasts positive metering in both directions due to its precision ground chrome-plated steel spool. The manually operated valve provides metered flow to either work port with the flow directly proportional to the lever's movement. All ports include 3/4NPT inlet and outlet connections alongside 1/2NPT work ports.

Designed without relief the closed center circuit type allows efficient handling of hydraulic systems. Recommended filtration for optimal function is 30 microns. The AO755 Series control valve uses Buna-N O-Rings and is equipped with a black nylon ball knob for user-friendly operation.

Key features include its small and lightweight design ensuring ease of installation while maintaining high performance standards. The tank port is required to return directly to the tank for effective operation. The valve's flow rating is 18 GPM.

MPN: AO755C4LD

Supplier Part Number: AO755C4LD

Specifications

Brand
Brand Hydraulics
Actuator Type
Lever
Body Material
Iron
Circuit Type
Closed Center
Color
Black
Configuration
Closed Center Spool
Connection Type
NPT
Dimensions
11 in L x 3.94 in W x 8.8 in H
grp Recommended Filtration
30 um
Handle Material
Nylon
Key
C
Number of Handles
1
Number of Ports/Ways
4
Number of Positions
3
Product Model
Mono-Block
Seal Material
Buna-N
Series
AO Series
Softgoods Material
Buna-N
Spool Action
Detented

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Product Questions & Answers (2)

Question by: Brett P on Jan 15, 2026, 10:48 AM
what's the max pressure this valve handles and is 3000 PSI enough for most standard hydraulic setups on farm equipment or skid steers?
Answer by: Customer Support on Jan 17, 2026, 6:36 AM
Rated at 3000 PSI, this valve covers the operating range of most agricultural and light construction hydraulic systems without issue. Skid steers, log splitters, and similar equipment typically run well under that ceiling, so you'd have plenty of headroom for everyday use. The flow rating is 18 GPM, which also lines up with what most mid-sized hydraulic systems push through a control valve like this.
Question by: Curt F on May 15, 2025, 9:41 PM
got a valve bank spot that’s tight. how big is this one and what’s it made out of
Answer by: Customer Support on May 17, 2025, 8:00 AM
Compact and light is the main idea with this monoblock style valve, so it fits well where space is limited. The body is cast iron, and it uses a precision ground chrome plated steel spool with Buna-N O-rings and a black nylon ball knob.

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