4 Operation
Study the instructions carefully.
The item refer to the parts list and service kits section.
NO= Normally open (pneumatic movement downwards)
NC= Normally closed (pneumatic movemetn upwards)
4.1
Description of valve function
The Unique SSV Two step valve has two pistons inside the actuator, which makes it possible to have an intermediate plug
position where all body ends are open.
The Unique SSV Two step valves are made in a Shut-off valve type and a Change-over valve type.
Step 1a
Type Shut-off valve (only NC)
Two step valves as Shut-off (only as NC) can be used for reducing pressure hammers or dosing e.g. in connection with filling of
a vessel where an exact volume is required.
The degree of opening for the intermediate position can be adjusted by removing spacer rings inside the actuator (see 4.5).
TD461-1015
AIR
F
Throttled position can be adjusted by
removing spacers.
Plug opening will increase if spacers
are removed.
TD 461-621_3
S
AIR
Closed
Throttled opening
Two step stroke activated
Full open
The plug opening for different shut-off valves and Actuator size is shown below.
Standard Actuator choice
(NC)
High pressure Actuator
(NC)
Dimensions = mm
Inch tube
DIN tube
Inch tube
DIN tube
1
½
”
2”
2
½
”
3”
4”
1
½
”
2”
2
½
”
3”
4”
2”
2
½
”
2”
2
½
”
F min.
Two step stroke
(with spacers inside
Actuators)
3
3
3
2.5
2.5
3
3
3
2.5
2.5
6
6
6
6
F max.
Two step stroke
(with spacers inside
Actuators)
6
11
11
14
14
6
11
11
14
14
9
9
9
9
S = full stroke opening
20
25
25
30
30
20
25
25
30
30
25
25
25
25
14
Содержание Unique SSV Two Step
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