Products / Parker / Refrigeration and Air Conditioning / Pressure Regulators- A4A- A4W
The A4 inlet family of regulators include valves that control inlet pressure. Each regulator is available with an assortment of additional variations which enable one regulator to preform several functions.
The A4A inlet family of regulators are
compact, heavy duty, pilot operated, and have remarkable
functionality. They sue upstream pressure for the opening force and
require a minimum 0.14bar (2psig) pressure drop to open. These
valves are normally ordered with close coupled upstream strainers to
prevent the entrance of foreign materials into the valve and rest of
system. The valve’s purpose is to modulate flow of refrigerant gas
or liquid to maintain constant upstream pressure as set-for, despite
load fluctuations.
Markets:
• Industrial Refrigeration
• Commercial Refrigeration
Features and Benefits:
• Pilot operated characterized Modulating Plug for precise control
• Suitable for all common refrigerants and oil
• 27.6bar (400psig) design pressure (MRP)
• Flanges threaded or welded steel pipe and copper tube (copper not
for ammonia)
• Interchangeable parts
• Easy to service
• Close coupled strainers, optional
• Many control variations are possible with the use of a few Modules
and Kits
• Stainless Steel Diaphragm
• Chrome Plated Pilot Seat
• Manual Opening Stem
Application:
• Depending on the specific variation of this valve, the application
may include, but is not limited to;
- Evaporator pressure control, temperature control, defrosting,
Maximum Cooling, regulating defrost, Crankcase pressure regulation,
Liquid Chillers, Low Pressure Drop, Hot Gas Bypass, Load Change
Compensation, Reducing liquid or vapor line pressure, any inlet
pressure control, Non-Atmospheric relief