Thread Low Lift Safety Valve

Thread Low Lift Safety Valve refers to a kind of safety valve with relatively small opening height and discharge capacity of valve disc. The sealing surface of the valve disc has two types: flat surface and conical surface. Their discharge area is calculated according to the area of the cylindrical surface or conical surface formed between the valve disc and the valve seat. The utility model has the advantages of simple structure and convenient manufacture, maintenance, test and adjustment. It is suitable for occasions with small discharge capacity, large back pressure and stable system pressure

Materials for main parts
Body: ASTM A216 WCB 
Nozzle: 2Cr13
Adjusting ring: 2Cr13 
Guide sleeve: 2Cr13
Bonnet: ASTM A216 WCB 
Spring: 50CrVA
Stem: 2Cr13 
Lever: ZG200-400
Adjusting bolt: AISI 1045 
Cap: ZG200-400

Standards compliance
Design and Manufacture: GB/T 12243-1989, ASME PTC 25.3, API RP 520, 521, API 526, API 527, EN ISO 4126
Face to face(end to end): GB/T14087-1993, JB/T6441-1992, JB/T2203-1999, JB/T9624-1999, JB/T53170-1999  
Flanged connection: ASME B16.5, DIN 2543~2545, EN 12627
Test and inspection: A ISO 5208, API 598, DIN 3230, MSS SP-117
Materials: Carbon Steel, Stainless Steel, Alloy Steel, Duplex or Other Specials 
Ends Connections: Flanged(FF, RF, RTJ) to international standards 
Sizes Range : 1/2”~12” (DN15~DN300)
Pressure Class: ANSI CL150, CL300, PN10, PN16