This standard specifies the design & structure, property, test, & inspection, mark, locking & lead seal and supply requirements for the spring-direct-load safety valve of gas compressor (hereafter referred to as safety valve simply).
This standard is applicable to the safety valve with its set-pressure being not greater than 42.0Mpa and its nominal dimension being not greater than DN40.
1 Scope
2 Normative References
3 Structures
4 Technical Requirements
4.1 Structural requirements
4.2 connection end
4.3 Valve body
4.4 Valve flap
4.5 Spring
4.6 Operation property of safety valve
4.7 Leak proof-ness
5 Material Requirements
5.1 Valve body
5.2 Valve base and valve flap
5.3 Orienting sleeve
5.4 Spring
5.5 Valve-flap sealing gasket
6 Test method and inspection rules
6.1 General requirements
6.2 Test methods
6.3 Inspection rules
7 Mark and Lead Seal
8 Supplies
9 Painting, Protection, Package, Storage and Transportation
Figure 1: Typical structure of safety valve with lifting handle for compressor
Figure 2: Typical structure of straight-through safety valve for compressor
Figure 3: Typical structure of flange-connection safety valve for compressor
Table 1: Limit Deviation of Spring Free Height (mm)
Table 2: Limit Deviation of Spring Inside Diameter (mm)
Table 3: Set-pressure Deviation of Safety Valve
Table 4: Re-seating Pressure of Safety Valve
Table 5: Leakage-test Leakage Rate of Safety Valve for Compressor
Table 6: Inspection Item, Technical Requirements and Inspection Method
