R900423333 MK30G1X/V Unidirectional throttle valve from Rexroth, Germany

FAQ: R900423333 MK30G1X/V Unidirectional Throttle Valve (Cartridge)

Q1: What type of valve is this, and how is it different from the Z2FS series?

A:​ This is a screw-in cartridge valve, not a subplate-mounted valve like the Z2FS series. It is designed to be installed (screwed) directly into a pre-machined cavity within a custom manifold or hydraulic block. This allows for highly compact and integrated system design. Its function (adjustable one-way throttle) is similar, but its form, installation, and application context are fundamentally different.

Q2: What does the model code "MK30G1X/V" tell us?

A:​ This is a standard product code for a cartridge valve:

• MK:​ Product family designation for screw-in cartridge-type throttle/check valves.

• 30:​ The nominal size code, which corresponds to a specific thread size (e.g., likely 1-1/16" -12 UN per SAE standards).

• G1X:​ Denotes the specific internal functional variant (spool/control edge design) and adjustment type.

• /V:​ Indicates the standard seal material version, typically FKM (Viton).

Q3: How is this valve installed and how does it work?

A:​ The valve is screwed into a specifically machined threaded cavity in a manifold. The cavity connects the valve's internal ports (typically labeled A, B, and sometimes a drain T) to the hydraulic circuit. The valve itself contains an adjustable orifice for flow in one direction and a check valve for free flow in the opposite direction. The exact flow path (which port is throttled) depends on the valve's orientation and the cavity porting.

Q4: What is the most critical requirement for using this valve?

A:​ The single most critical requirement is the correctly machined cavity. The valve's performance, pressure rating, and even basic functionality depend entirely on being installed into a cavity that matches the exact specifications (dimensions, threads, port locations, seal grooves) provided in the official MK series cavity datasheet. Using an incorrect cavity will lead to leaks, malfunction, or failure.