11Z47 - ESAB 11Z47 Acetylene Inlet Connection CGA 510 (C-67)

Technical Overview of the ESAB 11Z47 Inlet Connection

The ESAB 11Z47 is a critical replacement assembly designed for industrial acetylene regulators. Historically referenced as the C-67 assembly in legacy Linde, Purox, and Oxweld catalogs, this component serves as the primary interface between the high-pressure gas cylinder and the pressure reducing regulator. It is engineered specifically for Acetylene service and utilizes the standard CGA 510 connection geometry.

Manufactured from high-grade brass, the 11Z47 assembly is built to withstand the mechanical stresses of frequent cylinder changes and the pressure dynamics of industrial gas systems. The assembly typically includes the inlet nut and the inlet nipple (stem). The nut features the characteristic notches indicating left-hand threads, a standard safety feature for fuel gas connections to prevent cross-connection with oxygen or inert gas systems. The sealing surface of the nipple is precision-machined to mate perfectly with the cylinder valve outlet, ensuring a leak-tight seal which is paramount for safety when handling volatile fuel gases.

Proper maintenance of inlet connections is essential for the longevity of gas equipment. Over time, the seating surfaces of the nipple can become marred or scratched, and the threads on the nut can wear down, leading to potential leaks or difficulty in tightening. Replacing the entire inlet connection assembly with the genuine ESAB 11Z47 ensures that your regulator meets original factory specifications for safety and performance. This part is compatible with a broad spectrum of ESAB's heavy-duty and medium-duty regulator lines.

Installation and Safety

When installing the 11Z47, technicians should ensure that the regulator body threads are clean and free of debris. The use of an approved thread sealant or PTFE tape is generally not required on the CGA mating surface (the metal-to-metal seal between nipple and cylinder), but may be applicable on the NPT end connecting to the regulator body, depending on the specific regulator design. Always perform a leak test using an approved leak detection solution after installation and pressurization.