King nutronics 3666-12-101

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features
Overhaul Procedure Highlights
Important Cautions

The King Nutronics Corporation PN 3666-12-101 Control Valve Assembly is a critical component designed for use in the Model 3666 Automatic Pressure Calibrator. This manual provides comprehensive overhaul instructions, focusing on the replacement of seals, ceramic balls, seat assemblies, and springs within both the pressure and venting solenoid assemblies. The valve assembly is manufactured by King Nutronics Corporation, located at 6421 Independence Ave., Woodland Hills, CA 91367, and can be reached at PH: (818) 877-5460 or via their website at www.kingnutronics.com.

Function Description:

The Control Valve Assembly, PN 3666-12-101, is an integral part of a pressure calibrator system, responsible for precisely controlling pressure and venting operations. It incorporates solenoid assemblies that regulate the flow of pressure, ensuring accurate calibration. The assembly includes a pressure side and a vent side, each equipped with identical components for pressure regulation. The proper functioning of these solenoids, including their seals, ceramic balls, and seat assemblies, is crucial for maintaining the accuracy and reliability of the pressure calibrator. The valve's design allows for the controlled increase and decrease of pressure, which is essential for calibrating various pressure instruments.

Important Technical Specifications:

The Control Valve Assembly is identified by part number 3666-12-101. Key components of the assembly include:

Solenoid coil assembly (3666-254-1): The electromagnetic component that actuates the valve.
Gland nut (3666-257-1): Secures the solenoid coil assembly.
Identification label (3666-245-5): For product identification.
Spacer (3666-253-3) and Washer (3666-253-1): Used for proper component spacing and sealing.
Ball guide (3666-272-1): Guides the ceramic ball.
Ball spring (3666-263-1): Provides the necessary force for ball seating.
Ball (3666-12-9): A ceramic ball, critical for sealing and pressure control.
O-ring packings (KP150000800000, KP150011200000, KP150011000000): Essential for sealing various parts of the valve assembly to prevent leaks.
Valve seat assembly (3666-249-1): This assembly includes a valve seat permanently cemented onto an actuator guide assembly. It's important to note that this unit supersedes earlier versions with replaceable valve seats, and users should not attempt to remove the valve seat from the PN 3666-249-1 assembly to avoid damage.

The Gland Nut (2) must be tightened to 45 ft-lbs during reassembly to ensure proper sealing and operation. The valve's input port is marked "IN" and the output port "OUT" for correct installation. The device is designed for depot-level maintenance by experienced technicians, emphasizing the need for a clean, well-lighted workbench to prevent contamination.

Usage Features:

The Control Valve Assembly is specifically designed for integration into the Model 3666 Automatic Pressure Calibrator. Its primary role is to facilitate precise pressure control during calibration processes. The valve's operation involves solenoid actuation to manage pressure increases and decreases, enabling the calibrator to achieve specific test points. Users interact with the calibrator to program test points (e.g., 20, 200, 2,000, 5,000, and 10,000 psi) in both upscale and downscale directions. The valve's performance directly impacts the stability of the actual pressure displayed during calibration. Any instability, such as pressure continuing to increase past the setpoint or decreasing unexpectedly, indicates a potential issue with the valve's pressure or vent side, respectively.

Maintenance Features:

The King Nutronics Corporation PN 3666-245-1 repair kit is specifically designed for overhauling the PN 3666-12-101 Control Valve Assemblies. Each solenoid in the Control Valve requires one repair kit for overhaul. The repair kit includes all necessary components for replacing worn or faulty parts, such as the ceramic ball, ball spring, valve seat assembly, and various O-ring packings.

Overhaul Procedure Highlights:

Disassembly: The process involves removing the control unit chassis assembly from its case, disconnecting the wiring harness and tubing assemblies, and then disassembling the solenoid coil assembly. Key steps include removing the safety wire from the gland nut, loosening the gland nut, and carefully extracting components like the O-ring packings, valve seat assembly, ball, and ball spring.
Cleaning: All parts must be cleaned with isopropyl alcohol and blown dry with compressed air to ensure a contaminant-free reassembly.
Reassembly: This involves inserting the spacer and washer, ball guide, replacement ball spring, and ceramic ball. New O-ring packings are installed on the valve seat assembly. The valve seat assembly is then inserted into the valve body, followed by positioning and securing the solenoid coil assembly with the gland nut.
Torque Specification: The gland nut must be tightened to 45 ft-lbs using a torque wrench, and then safety wired to the valve body.
Reinstallation: The control valve is reinstalled into the chassis assembly, tubing connections are tightened, and the wiring harness is reconnected.
Function and Leak Tests: After overhaul, the valve assembly must undergo rigorous testing. This includes configuring the calibrator for standard gauge calibration, programming various test points, and observing pressure stability. Leakage checks involve monitoring for pressure increases past the setpoint (indicating a pressure side leak) or applying bubble solution to the VAC port for decreases (indicating a vent side leak).

Important Cautions:

The Stroke Adjustment Seal and Stroke Adjustment Assembly on the Solenoid Coil Assembly are factory-set and should not be tampered with or readjusted.
The repair kit (PN 3666-245-1) is only compatible with PN 3666-12-101 Control Valve Assemblies and not with earlier versions (PN 3666-12-1).
Seal and ball component replacement should only occur after confirming that improper valve operation is due to faulty seals or worn ball actuation mechanisms.
Avoid unnecessary swapping of solenoid components (coils, actuators, seat assemblies, bodies) due to tight tolerances.
The Valve Seat Assembly (PN 3666-249-1) has a permanently cemented valve seat; attempting to remove it will cause damage.

This comprehensive approach to maintenance ensures the longevity and accuracy of the King Nutronics Corporation PN 3666-12-101 Control Valve Assembly, a vital component for high-precision pressure calibration.