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Decompression valves from AMP!
The purpose of using decompression valves at cold rooms is to maintain the internal and external pressure balanced.
Decompression valves description
Top quality decompression valves
The purpose of using decompression valves at cold rooms is to maintain the internal and external pressure balanced.
Decompression valves specifications
Pressure variations
The pressure variations periodically occur during the different defrosting phases and during the opening & closing of the cold room door.
Decompression valve
The lack of a decompression valve installation may cause the following problems: quick door opening resulting in deterioration of the stored products and crackings in coincidence of the panel connections and consequent frosting.
Models
The valves are supplied in three different models depending of the internal volume (V) of the cold room – small (from 30 up to 50 m³), medium (from 50 up to 100 m³) and large (from 100 and up to 800 m³).
FAQ
Why are decompression valves needed in cold rooms?
During the operation of cold rooms (to maintain products at constant temperature and humidity conditions), complex physical pressure processes occur that, if not properly controlled, can lead to malfunctions, increased costs and damage.
This is exactly where a small but hugely important component comes to the rescue: the decompression valve.
What causes pressure changes?
Pressure changes in cold storage rooms are due to three main causes:
- Sudden cooling of the air when the refrigerator door is opened and warm outside air enters, which then cools and contracts, creating negative pressure.
- Thermal expansion during defrosting , where the temperature of the refrigerator compartment increases temporarily and positive pressure is caused.
- Frequent air changes from opening and closing the doors of refrigeration chambers, which cause constant fluctuations in internal pressure.
What happens if there is no valve?
If pressure changes are not balanced mechanically, problems arise:
- Resistance to opening the refrigerator door due to negative pressure, resulting in damage to the hinges, seals and latches.
- Deformation of the joints or the panel of the chamber due to pressure differences. (Suction)
- Formation of condensation or ice inside , leading to poor operation and spoilage of products. (Ice at zero degrees Celsius will cause an increase in temperature in freezer chambers operating at -20 °C)
- Loss of cooling efficiency and increased energy consumption by the refrigeration machine.
- Risk of failure at critical points in construction , especially in large chambers.
How does the decompression valve work?
The decompression valve is automatically activated when it detects a pressure difference within a predetermined range (usually ±3 to ±10 mbar) and operates in two directions:
- Allows air to enter in case of negative pressure
- Allows air to exit when there is positive pressure
The models of decompression valves for freezers installed at negative temperatures are heated, that is, they include a heating element (resistance) to prevent the valve from freezing.
Use in freezers and environments < -20°C
At extremely low temperatures (e.g. -20°C to -40°C).
Where are they used?
Pressure relief valves are essential in a variety of applications:
- Food and pharmaceutical cold storage rooms
- Logistics freezers
- Food industries
- Panel refrigerators in supermarkets & retail stores
- Professional catering
What should I pay attention to when choosing?
For proper operation, it is important to select the appropriate valve based on:
- The volume of the chamber (m³)
- The frequency and duration of door opening
- The temperature range of the cold storage or freezer chamber
Installation is usually done on the ceiling or upper side wall , in a spot protected from constant air flow or cold drafts.
What does AMP offer?
AMP decompression valves:
- Guarantee complete protection against pressure changes
- Manufactured to withstand demanding conditions
- Available in various sizes and types , depending on the size and type of cold room
- Comes with certifications and technical support
Conclusion
Installing a decompression valve in a cold room is not an option — it is a necessity . Without it, the risk of damage, energy loss, and deterioration of the refrigerant charge is real and significant.
AMP offers you ready-to-deliver decompression valves for cold storage and freezer chambers.
Parts
