Structure And Function; Control Functions - Burkert 2103 Instructions De Service

Structure and Function

7. sTrucTure and funcTiOn
7.1. structure
The piston-controlled diaphragm valve consists of a pneumatically
actuated piston actuator and a 2/2-way valve housing.
The actuator is manufactured from polyphenylene sulphide (PPS) /
stainless steel.
Control air connection for SFA, SFB, SFI
Second control air connection for SFI
and air discharge connection for SFA and SFB
Transparent hood with position
indicator
Actuator cover with piston running
bush
Actuator housing
Diaphragm socket
Line connection
Diaphragm housing
Fig. 17: Piston-controlled diaphragm valve, structure and
description
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Type 2103
7.2. function
Spring force (SFA) or pneumatic control pressure (SFB and SFI)
generates the closing force on the diaphragm pressure piece. The
force is transferred via a spindle which is connected to the actuator
piston.
7.2.1. control functions
Control function a (sfa)
Closed by spring force in rest position
A
P
Control function B (sfB)
Opened by spring force in rest position
A
P
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