This standard is applicable to industrial pipeline gate valves, globe valves, throttle valves, ball valves, butterfly valves, diaphragm valves, plug valves, check valves, safety valves, pressure reducing valves, steam traps, plunger valves. 

1. The valve model preparation method is as follows:

2. The type code is indicated by Chinese pinyin letters, as specified in Table 1.

Type Code Type Code Gate valve Z plug valve X globe valve J Check valve and bottom valve H Throttle valve L safety valve A ball valve Q reducing valve Y Butterfly valve D trap valve S diaphragm valve G plunger valve U

Note: Low temperature (below minus 40 degrees Celsius), insulation (with heating layer) and valves with bellows are added separately before the type designation

"D", "B" and "W" Pinyin letters.

3. The transmission code is indicated in Arabic numerals, as specified in Table 2.

Table 2 Transmission mode Code Transmission Mode Code Electromagnetic 0 bevel gear 5 electromagnetic-hydraulic 1 Pneumatic 6 electro-hydraulic 2 hydraulic 7 worm gear 3 gas-hydraulic 8 spur gear 4 electric 9

Note: (1) hand wheel, hand incompatible and plate hand drive and safety valve, pressure reducing valve, trap omit this code.

(2) For pneumatic or hydraulic: normally open with 6K, 7K; Normally closed form 6B, 7B; Pneumatic belt hand use 6S watch

The explosion-proof electricity is indicated by "9B". The worm T-shaped nut is represented by 3T.

4. The connection form code is indicated by an Arabic numeral code as specified in Table 3.

Note: The sealing surface material code of the valve seat directly processed by the valve body is indicated by "W", when the sealing surface material of the valve seat and valve disc (gate)

At the same time, it is indicated by a low hardness material code (except diaphragm valves).

Seven. Nominal pressure value, according to JB74-59 "Pipeline accessories nominal pressure, test pressure and working pressure" provisions. For valves used in power plant industry, when the maximum temperature of the medium exceeds 530 degrees Celsius, the working pressure shall be marked according to Article 5 of JB74-59.

8. The material code of the valve body shall be indicated by Chinese pinyin letters, as specified in Table 15.

Table 15

Valve body Material Code Indicates the material code of the valve body

Gray cast iron ZCr5MoI

Malleable cast iron K1Cr18Ni9TiP

Ductile iron QCr18Ni12Mo2TiR

Copper and copper alloy T12CrMoVV

WCBC

Note: PN≤1.6MPa gray cast iron valve body and PN≥2.5MPa carbon steel valve body omit this code.