Safety Valve

Introduction of Shuangtai Brand Safety valve:
Shuangtai Brand safety valve, as the best device for extra-pressure prolection, wi automatically open and fuly discharge to protect theequipment pressure from going on rise when medium's pressure rises over the allowed value and wil automaticaly close when the pres
sure lowers to the setting value.The valve confoms with GB/T12243-2005 on its design, manufacture and acceptance etc. technical standards.The bonnat of the sealed safely valve is anclosed in order to protact dust and foreign matters from geting in and protect toxic and co.mbustible medla from over-low, whle the opened boonet of the open-lype safely valve, which benefits to lower the temperature inside olthe spring chamber, is mainly used for the pipeline and containar with steam madium and the safety valve with radiator is suitable for themedium with a temperature over 350C.
For the safety valve with a laver, it can be opened manually with the laver when the medium's pressure is up to ovar 75% of that atwhich the valve opens.
Ful-bore safely valve's height of opening> 1/4 time the flow diameter with a large amount of discharge, the height of opening for alow-lift safety valve 1/20-1/40 time the fow diameter.

Method ofcompiling the types safety valve

The types of valves are generally complled in accordance with the standard of the ministry of machine-building industry, JB3082004 “ Method of Compiling the Types of Valves " , which is composed of eight parts:

Material code of body (Table Four)

Valve of nominal pressure

Material code ofsealing surface ofseat or lining (Table Three)

Code of structural form (Table Two)

Code of connecting form (Table One)

Code oftype( “A"indicates safety valves)

Code of special valve

(such as low-temperature - D, insulation - B, corrugated pipe-W, no omission)

Code of Shuangtai valves Co.. Ltd.

Table One

Table Two

The material codes of sealing surface of seal or lining are indicated by Chinese phonetic leters as they are listed in table three.

Table Three

Remarks:
" W " indicates the material of sealing surface of seat which is processed directly together with the body. The materialof sealing surface of seat is indicated by a code of low hardness material if it different from the material of sealingsurface of disc. The body of materials codes can indicated by Chinese phonetic letters as they are listed in the table four.

Table four

Remarks: lf the PN of cast-iron body is as much as or less than 1.8 MPa and the PN of carbon steel body is as much as of morethan 2.5MPa the present codes can omitted.
Examples:
A42Y_16C indicates: The safety valve of closed spring loaded full bore, Connected with flange. The sealing surfacematerial is stellite, The nominal pressure is PN1.6MPa and the body material is carbon steel.

The conditioning pressure class of safety valve (MPa)