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Trim No. and Leakage Rate in Globe / Gate valves

Trim No. and Leakage Rate in Globe / Gate valves

Trim No. and Leakage Rate in Globe / Gate valves

(OP)
Is there any relationship between trim no. specified in API 600 and leakage rate specified by DIN 3230-3 or any other standards in a globe or gate valve?
Thanks.

RE: Trim No. and Leakage Rate in Globe / Gate valves

TRIM NO ACCORDING TO API LIKE 1,5,8 ETC ARE RELATED TO DIFFERENCE IN HARDNESS / TO AVOID GALLING + SERVICE TEMPERATURE. NOT SURE IF RELATED TO LEAKAGE

RE: Trim No. and Leakage Rate in Globe / Gate valves

There is no relationship between the trim number and the leakage rate. The trim number simply defines the materials of the two mating surfaces.

Leakage rate is determined by: type of seating i.e, soft-seated or metal-seated; type of valve i.e. gate, check, high performance butterfly, etc; surface finish; and other factors.

RE: Trim No. and Leakage Rate in Globe / Gate valves

Take a look at :

API 6A/598

for leakage rates.

RE: Trim No. and Leakage Rate in Globe / Gate valves

here is a simple look at the most common leakage classes and how valves are tested to establish that leakage rate.

ANSI CLASS         Class III          
Maximum Seat Leakage     0.1% of rated valve capacity      Test Conditions
Air or water @ 50 - 125 F.               45 - 60 psig or Maximum operating differential pressure whichever is less
                     
                
ANSI                    Class IV              Maximum Seat Leakage    0.01% of rated valve capacity     Test Conditions    
Air or water @ 50 - 125 F.               45 - 60 psig or Maximum operating differential pressure whichever is less
                     
                
ANSI                     Class VI                  Maximum Seat Leakage     1" Port Diameter         
0.15 ml per minute or 1 bubble per minute     
Test Conditions    
Air or Nitrogen @ 50 - 125 F          50 psig or Maximum operating differential pressure whichever is less

Simplified Chart for most popular leakage classes. For complete specifications refer to ANSI/FCI 70-2

This should at least give you a start on leakage classifications.

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