VK4-7213-201-4-1

The Schneider Electric VK4-7213-201-4-1 valve assembly operates as a pneumatic globe control valve with a positive positioner feature integrated. The design supports a stem-up-open valve pattern that ensures normal opening conditions during functionality. It falls within the 1/2 inch size category, effectively accommodating various installation requirements in industrial settings. The flow coefficient of this valve is specified at 0.4 Cv, which facilitates controlled fluid passage.

This assembly utilizes NPT threaded connections for its ends, ensuring secure pipe integration. The valve body is made from bronze, which is complemented by a trim constructed of a brass plug paired with an EPDM disc for effective sealing. The MK-2690 actuator model drives the valve; it provides an effective area of 6 square inches, making it capable of responsive action to control signals. A spring range of 3 to 7 psig governs the actuator's operation.

In addition to these features, the assembly includes a factory-fitted positive positioner, identified as the AK-42309-500 positioner within the VK4 series, which enhances its operational accuracy. The system requires a supply air pressure of either 15 or 20 psig and achieves close-off pressure ratings of 130 psi when supplied with 15 psig and 220 psi with 20 psig, demonstrating significant reliability under varying conditions.

This valve can handle control media within a temperature range of -7°C to 138°C. It meets ANSI pressure class specifications of 250 psi, with capabilities extending to a maximum of 400 psi at temperatures below 65°C. Overall, the VK4-7213-201-4-1 assembly is engineered for precise control in pneumatic applications, ensuring stability and efficiency in operations.