Moog D633-A Series, Руководство пользователя

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3 Product Description Hydraulics
© Moog GmbH User Manual "D633-A Series" (CA80942-001; Version 1.0, 12/08) 17
3.3.2.2 2-way and 2x2-way operation
2-way and 2x2-way
operation
With 2-way and 2x2-way operation the valves can be used to control the flow in
one direction (used as throttle valves).
With 2x2-way operation the valve can be used in 2-way applications for greater
flows.
Ports P with B and A with T must be externally connected for this purpose.
The direction of flow must be observed as per
figure 6 .
Ö
Chapter "3.2.1.1 Valves with fail-safe function F, D or M", page 14
3.3.3 Leakage port Y
Leakage port Y
Leakage port Y must be used in the following cases:
• when the pressure p
T
in tank port T is greater than 50 bar (725 psi)
• with 2x2-way operation
3.3.3.1 Y-identification
Y-identification
(7th position in type
designation)
The Y-identification, i.e., the 7th position in the valve type designation, indi-
cates how leakage port Y is configured in the valve.
Overview of type designation:
Ö Chapter "3.5 Nameplate", page 18
Leakage port Y must always be connected with 2x2-way operation.
Ö
Chapter "3.3.3 Leakage port Y", page 17
Figure 5: 2-way operation with mechanical
fail-safe function M (hydraulic symbol)
Figure 6: 2x2-way operation with mechanical
fail-safe function M (hydraulic symbol)
The valve can be supplied either with or without leakage port Y.
It is necessary when ordering the valve to establish whether leakage
port Y is to be used.
Whether leakage port Y is used can be ascertained from the Y-identifica-
tion, i.e., the 7th position in the type designation.
Ö Chapter "3.3.3.1 Y-identification", page 17
Type designation:
1 2 3 4 5 6 7 8 9 10
A
• •
K
•
5
• • • • •
Ident. Leakage port Y Can be used at
0 Closed, with screw plug Pressure in tank port p
T
≤
50 bar (725 psi)
3 Open, with filter element Pressure in tank port p
T
>
50 bar (725 psi)
Table 4: Y-identification in the type designation
Y-identification