Specifications

Model 50 Valve, Continued
Step Procedure
5. Turn the nut ¼ turn (90 degrees) past the point where the
ferrule first starts to grab the tubing.
6. Remove the fitting and inspect it. The ferrule may be free to spin
axially on the tubing but should have no lateral movement along
the tubing. If it does, reinstall the fitting and tighten it another 1/8
turn past finger tight. Remove, re-inspect and repeat if
necessary.
Use the Valve Assembly Fixture, Siemens PN 2020281-001, properly
align the Diaphragms when rebuilding the Model 50 Valve. The fixture
consists of a base (1), 2 guide pins (2) and a diaphragm placement disc
(3). This fixture will allow the user to place the diaphragm in the center of
the valve. If the diaphragm is not in the center it may leak.
Replacing Diaphragms
Step Procedure
1. Remove the old diaphragms from the plates. DO NOT attempt
to reuse the old diaphragms.
2. With the pins installed in the fixture base, place the bottom plate
of the valve on the base. The pins should fit in the mounting
holes on the bottom plate and hold it in place.
3. Position the placement disc on the bottom plate and set the
diaphragm in place.
4. Carefully remove the placement disc without moving the
diaphragm. Inspect the diaphragm for proper alignment.. If the
diaphragm is not in the center of the plate, repeat the placement
procedure using the placement disc.
5. Place the middle plate on the valve taking care to use the
correct holes. Check the alignment mark on the side of the
plate. It should align with the mark on the bottom plate. If not,
the middle plate is upside down and must be removed, turned
over, and reinstalled correctly.
4-24 A5E31405710001