Pilot-Operated Refrigeration Valve With Serviceable Control Ports
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Solution Overview
Problem
Industrial refrigeration systems face challenges in controlling fluid flow due to corrosion and the need for efficient, accessible, and configurable valve solutions that can handle severe sticking and require easy maintenance in corrosive environments.
Innovation Solution
A weld-in-place control valve with a replaceable cartridge and port plate that allows for angular mounting of functional ports, enabling easy attachment and removal of control elements without interference, and includes a manually operable valve stem for overcoming sticking issues, all constructed from corrosion-resistant materials like stainless steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a manual valve stem is provided for direct operation, then adequate force can be provided to open the valve even in cases of severe sticking, but the valve stem may be subjected to side loads causing binding
Solution Approach 1:
A guide member is introduced as an intermediary component between the manual valve stem and the piston. The guide member receives axial force from the valve stem and transmits it to the piston while constraining lateral movements, thereby preventing side loads and binding during valve operation
2Adaptability or versatility
If control elements are mounted on the port plate, then valve functionality can be configured and controlled, but access to fasteners for removing the port plate is blocked
Solution Approach 1:
The ports are arranged asymmetrically at angular orientations (e.g., 45 degrees) relative to the fastener locations. This asymmetric geometry creates angular clearance between mounted control elements and fasteners, allowing simultaneous access to both control elements and fasteners without interference
3Reliability
If a plunger cover is added to protect the valve stem, then contaminants can be prevented from attacking the valve stem and seals, but the structure becomes more complex
Solution Approach 1:
A plunger cover is provided that extends over the valve stem protruding from the port plate. This cover acts as a protective enclosure, preventing contaminants from reaching and damaging the valve stem and associated seals, thereby improving reliability without significantly complicating the overall valve structure
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A valve for a refrigeration system includes a valve body having an inlet port, an outlet port, and walls forming a main cavity. The valve also includes a cartridge that resides within the main cavity and having a piston configured to travel in a first direction to permit fluid flow from the inlet port to the outlet port and in a second direction to impede fluid flow from the inlet port to the outlet port and a port plate configured to removably couple to the valve body to substantially close an end of the main cavity substantially enclosing the cartridge within the main cavity, the port plate including a plurality of ports, each port configured to accept at least one of various valve control elements configured to control the piston to permit or impede the fluid flow from the inlet port to the outlet port.