Frequently Asked Questions (FAQs) about Shut-Off Valves
What are shut-off valves used for in refrigeration systems?
Shut-off valves provide manual isolation capability for system components, allowing for maintenance, repairs, or emergency shutdown without evacuating the entire system. In industrial refrigeration applications, properly positioned shut-off valves are essential for system servicing, component replacement, and safety isolation during emergencies.
What types of shut-off valves do you offer?
Our inventory includes globe valves (like Parker's T5F and T5VAF series), angle valves (such as Parker's T6F and T6VAF series), and various connection options including weld neck (WN), socket weld (SW), and threaded connections. We stock Hansen's complete line, Danfoss valve solutions, and Parker's comprehensive portfolio in sizes ranging from 1/2" to 8" to meet all application requirements.
How do I choose between globe and angle shut-off valves?
Globe valves (like Parker's "HV,4WN GLOBE T5VAF SS W/CAP") provide straight-through flow ideal for in-line installation, while angle valves (such as "HV,1WN ANGLE T6VAF SS W/CAP") offer 90-degree flow path changes, perfect for space-constrained installations or when a directional change is needed. The choice depends primarily on your piping configuration and space limitations.
What's the difference between standard and stainless steel (SS) valve options?
Parker's stainless steel valves (with "SS" designation like "HV,2WN GLOBE T5VAF SS W/CAP") feature stainless steel components in critical areas that contact the refrigerant, offering superior corrosion resistance and longer service life. While standard valves are more economical, stainless steel options provide better long-term value in harsh environments or with corrosive refrigerants.
How do I select the correct connection type for my system?
Connection type should match your existing piping system. Weld neck (WN) connections (like "HV,8WN ANGLE EB T6F-L W/CAP") provide superior stress distribution for high-pressure applications, socket weld (SW) options (such as "HV,3/4SW GLOBE T51F W/CAP") offer excellent leak protection for permanent installations, and threaded (FPT) connections allow for easier servicing but may be more prone to leaks over time.
What size shut-off valve should I select for my refrigeration system?
Valve size should match pipe size to minimize pressure drop while providing adequate flow capacity. For critical applications, proper sizing calculations should consider flow rate, pressure differential, and acceptable pressure drop. While matching existing pipe size is common practice, larger systems may benefit from full-port valves that minimize restrictions.
What maintenance is required for industrial refrigeration shut-off valves?
Regular maintenance includes stem packing inspection, checking for proper valve operation, and periodic stem lubrication. Parker's hand valves with seal caps ("W/CAP" in model names) provide additional stem protection and reduced maintenance requirements. Most quality shut-off valves should be inspected annually, with stem packing typically replaced every 5-7 years depending on operating conditions.
How do extended bonnet (EB) valves differ from standard models?
Extended bonnet valves (designated "EB" in Parker models like "HV,3WN GLOBE EB T5F-L W/CAP") feature an extended stem design that positions the packing and operating mechanism away from extreme temperatures, providing better reliability in cold applications by keeping stem packing warmer. These valves are particularly important for low-temperature ammonia applications where standard valves might experience stem binding.
Are seal caps necessary for shut-off valves?
Seal caps (indicated by "W/CAP" in Parker models) provide additional stem seal protection, prevent unauthorized operation, and offer secondary containment in case of stem packing leaks. While not absolutely required, they represent best practice for industrial refrigeration applications, particularly for valves in ammonia service or those infrequently operated.
How quickly can I receive a shut-off valve for emergency replacement?
We maintain over 600 shut-off valves in stock ready for immediate shipping across Canada and the US. Popular models can be expedited for emergency situations, helping minimize your system downtime. Our technical experts can assist in identifying the exact replacement valve if you're unsure which model matches your existing installation, ensuring you receive the right component for your emergency repair.
