1
Q
A
Pilot to Open Check Valve
2
Q
A
Pilot to Close Check Valve
3
Q
A
Shuttle Valve
If the pressures are equal, they will both flow through.
4
Q
A
Manual Override
5
Q
A
Lever
6
Q
A
Solenoid
7
Q
A
Pilot Pressure
8
Q
A
3 Envelope
9
Q
A
2 Envelope
10
Q
A
4/3 DCV
11
Q
A
2/2 DCV
12
Q
A
Closed
13
Q
A
Tandem
14
Q
A
Float
15
Q
A
Open
16
Q
A
Closed
17
Q
A
Open
18
Q
A
Float
19
Q
A
Tandem
20
Q
4/3 Lever operated, spring return, tandem center
A
4/3 Lever operated, spring return, tandem center
21
Q
A
2/2 spring offset, solenoid operated, normally something
