General
No Symbol Symbol designation No Symbol Symbol designation
1. GENERAL CONVENTIONAL SYMBOLS 2.13 Blank flange
1.1 Pipe 2.14 Spectacle flange
1.2 Pipe with indication of direction flow 2.15 Orifice
1.3 Valves, gate valves, cocks and flaps 2.16 Orifice
1.4 Appliances 2.17 Loop expansion joint
1.5 Indicating and measuring instru-
ments
2.18 Snap coupling
1.6 High-pressure pipe 2.19 Pneumatic flow or exhaust to
atmosphere
1.7 Tracing 3. VALVES, GATE VALVES, COCKS AND FLAPS
1.8 Enclosure for several components
as-sembled in one unit
3.1 Valve, straight through
2. PIPES AND PIPE JOINTS 3.2 Valve, angle
2.1 Crossing pipes, not connected 3.3 Valve, three-way
2.2 Crossing pipes, connected 3.4 Non-return valve (flap), straight
2.3 Tee pipe 3.5 Non-return valve (flap), angle
2.4 Flexible pipe 3.6 Non-return valve (flap), straight
screw down
2.5 Expansion pipe (corrugated) general 3.7 Non-return valve (flap), angle, screw
down
2.6 Joint, screwed 3.8 Safety valve
2.7 Joint, flanged 3.9 Angle safety valve
2.8 Joint, sleeve 3.10 Self-closing valve
2.9 Joint, quick-releasing 3.11 Quick-opening valve
2.10 Expansion joint with gland 3.12 Quick-closing valve
2.11 Expansion pipe 3.13 Regulating valve
2.12 Cap nut 3.14 Ball valve (cock)
MAN Diesel & Turbo
1655279-1.1
Page 1 (10)
Symbols for piping
I 00 25 0
L27/38S, L16/24, L16/24S, L21/31, L21/31S, L23/30H, L23/30S, L23/30DF,
L28/32H, L28/32S, V28/32H, V28/32S, L27/38, L28/32DF
2015.11.17
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