Valve Types

Purpose:

• Isolate equipment for servicing
  
  
• Isolated portions of the system not in use
  
  
• Provide manual cross connection from one component or system to another
  
  

Types:

Globe Valve

• The most common valve for refrigeration systems
  
  
• Used for all refrigerants
  
  
• Flow for all refrigerants
  
  
• Flow thru the valve S turn
  
  
• High resistance to flow (pressure drop)
  
  
• Cast body able to withstand high pressures
  
  
• Captive spindle (refrigeration uses preferred)
  
  
• Valve packing isolates refrigerant from atmosphere
  
  

Angle Valve

• Used for all refrigerants
  
  
• Flow thru the valve is 90 degrees relative to the inlet
  
  
• Lower resistance to flow (pressure drop)
  
  
• Cast body able to withstand high pressures
  
  
• Captive spindle (refrigeration used)
  
  
• Valve packing isolates refrigerant from atmosphere under line pressure
  
  

Diaphragm Valve

• Used for all refrigerants
  
  
• Flow thru the valve 90 degrees relative to the inlet
  
  
• Lower resistance to flow (pressure drop)
  
  
• Cast body able to withstand high pressures
  
  
• Hermetic seal between bonnet, diaphragm, and body
  
  

Gate Valve

• Used for secondary refrigerants
  
  
• Flow is straight thru
  
  
• Not used for throttling flow
  
  

Ball Valve

• Used for all refrigerants
  
  
• Flow is straight through
  
  
• Lower resistance to flow (pressure drop)(least flow resistant)
  
  

Butterfly Valve

• Used for secondary refrigerants
  
  
• Flow is straight through
  
  
• May be used for throttling flow
  
  

Line Piercing Valve

• Used where system does not have service valves
  
  
• May be installed or system under pressure
  
  
• Tends to leak as rubber O-ring deteriorates
  
  
• Bolt on type
  
  
• Solder type (on a vapor line)
  
  

Refrigerant Service Valve

• For servicing