Nomenclature of valve bodies

Example of valve body nomenclature for shut-off valves:

PS55|DN32|S50|RX|35|2LA66

Maximum allowable pressure in bar

PS55|DN32|S50|RX|35|2LA66

Nominal diameter

PS55|DN32|S50|RX|35|2LA66

Material
GG: (grey) cast iron
S: steel
MS: brass
AL: aluminium

PS55|DN32|S50|RX|35|2LA66

Size of valve body (only for steel valves)

PS55|DN32|S50|RX|35|2LA66

Maintenance connections (position and quantity),
max. 2 connections per valve are possible, designated as
T: top
R: right
L: left
X: none

Exemplary designations are
TT: 2 connections on top of the valve
RX: 1 connection on the right side of the valve
RL: 1 on the right, 1 on the left
XX: no maintenance connection

PS55|DN32|S50|RX|35|2LA66

Inside diameter in mm
xx: none
For threaded connections, the thread is listed in more detail, e.g. 1 1/4-12UNF or 2 1/4-12UN.

PS55|DN32|S50|RX|35|2LA66

Connection to compressor
For flange connections (as here), the following is specified:
2: number of screws
LA66: hole spacing in mm
For threaded connections, the thread is listed in more detail, e.g. 1 1/4-12UNF or 2 1/4-12UN.

Sketch of the valve in the above example
Nominal diameters (DN) are not actual dimensions!

Nominal diameters (DN) are not actual dimensions!

The nominal diameters DN10 .. DN200 only indicate ranges! The number is not a quantifiable unit, it is only indirectly related to the diameters of the connections and should not be used in calculations.