Frequently Asked Questions (FAQs) about CK4 Check Valves
What are Parker CK4 check valves used for in refrigeration systems?
Parker CK4 check valves are high-capacity, heavy-duty valves designed for large-scale industrial refrigeration applications where backflow prevention is critical. These spring-loaded piston design valves maintain flow direction in ammonia and halocarbon systems across liquid, suction, and hot gas lines, providing reliable protection for major industrial refrigeration equipment and ensuring operational efficiency in demanding applications.
What sizes and configurations are available for CK4 check valves?
CK4 check valves are available in sizes ranging from 1/2" (like "CK VLV,1/2 CK4A-2" at $205.92) up to 3" industrial models, with both socket weld and weld neck connections. Popular configurations include "2", S4A, 2" Socket Weld, 120G ST CK4" and "3", S4A, 3" Weld Neck, 120G ST CK4" at $7,745.69, reflecting the substantial engineering required for larger industrial applications.
What's the difference between S4A, S4AD, and S5A designations in CK4 models?
The S4A, S4AD, and S5A designations indicate different actuator or pilot configurations within the CK4 series. S4AD models (like "2-1/2", S4AD, 2-1/2" Socket Weld, 120R, ST, CK4") appear to be specialized dual-action configurations, while S5A models (such as "1-5/8", S5A, 2" Socket Weld, ST, CK4") may offer different operational characteristics or enhanced performance features for specific applications.
What do the spring designations (120G, 120R, 120EXT, 120) mean in CK4 valves?
Spring designations determine the valve's opening pressure and operational characteristics: 120G and 120R indicate different spring ranges, 120EXT suggests extended or enhanced spring configuration, and 120 represents standard spring setup. For example, "2", S4A, 2" Socket Weld, 120EXT ST CK4" at $3,618.91 costs more than the standard "120 ST" version at $3,580.18 due to enhanced spring features.
What's the significance of ST (stainless trim) and QD designations?
ST (Stainless Trim) indicates stainless steel components in critical refrigerant-contact areas for enhanced corrosion resistance and longer service life. QD (Quick Disconnect) allows for easier maintenance and service access. Models with both features, like "3", S4A, 3" Socket Weld, 120R QD ST CK4" at $7,533.80, provide maximum durability and serviceability for critical applications.
How do CK4 valves differ from CK1 and CK2 check valves?
CK4 check valves are heavy-duty, high-capacity valves designed for large-scale industrial applications, while CK1 valves are for horizontal installation only and CK2 valves offer enhanced performance over CK1. CK4 models feature spring-loaded piston design with full-flow capacity and are suitable for liquid, suction, and hot gas lines, making them the most versatile and robust option in Parker's check valve lineup.
Can CK4 check valves handle hot gas applications?
Yes, CK4 check valves are specifically designed for use in hot gas lines as well as liquid and suction applications. The spring-loaded piston design and full-flow capacity make them suitable for the higher temperatures and pressures encountered in hot gas defrost systems and other demanding thermal applications in industrial refrigeration.
What connection options are available for CK4 check valves?
CK4 valves are available with both socket weld and weld neck connections. Socket weld options (like "2", S4A, 2" Socket Weld, 120G ST CK4") provide excellent leak protection for permanent installations, while weld neck configurations (such as "3", S4A, 3" Weld Neck, 120G ST CK4") offer superior stress distribution for high-pressure applications and typically cost slightly more.
How do I select the correct CK4 valve size for my application?
CK4 valve sizing should match your pipe size and flow requirements, with consideration for pressure drop and system capacity. Larger valves like the 3" models handle substantial flow rates required for major industrial systems, while smaller sizes like 1-5/8" and 2" models are appropriate for branch lines or lower capacity applications. The full-flow design minimizes pressure drop across the valve.
What maintenance considerations are important for CK4 check valves?
CK4 check valves require periodic inspection for proper operation, particularly in hot gas applications where thermal cycling can affect spring performance. QD (Quick Disconnect) models facilitate easier maintenance access, while ST (Stainless Trim) versions reduce maintenance frequency due to enhanced corrosion resistance. The spring-loaded design ensures reliable operation but may require spring replacement over time in high-cycle applications.
