The priority valve has three modes of operation:
-full system pressure, the valve is open and fluid goes from port A (inlet) to port B (outlet),
R LP Filter Figure 020
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R Relief Valve Figure 021
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R Priority Valve Figure 022
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-system pressure low, the valve is closed and fluid cannot get from port A to port B,
-more pressure downstream of the valve (at port B) than in the main system. The valve lets fluid flow from port B to port A.
The priority valve has a cylindrical body with a mounting flange. The mounting flange has the hydraulic connections which are of the bobbin type (Ref. 29-00-00). The body contains the hydraulic valves and seats and the spring pack.
M. Sampling Valve 1187GM
R (Ref. Fig. 023) The sampling valve is installed on the system HP manifold. It consists of a cylindrical body which holds a needle valve. A spring keeps the valve closed. The valve assembly includes an end cap which must be removed to get a sample of fluid. The end cap has a slot which makes it possible to use it as a tool to open the valve. The outlet of the valve has a push-on connection for a plastic plastic hose.
N. Check Valves
R (Ref. Fig. 024)
**ON A/C 001-049, 051-058, 101-101,
The system has two types of check valves:
-
the cartridge type,
-
the in-line type.
The cartridge type of check valve (1059GM and 1094GM) is installed in the HP and PTU manifolds. The valve has a stainless steel or aluminium alloy cylindrical body with a screw thread. One end of the body is closed and has a hexagonal head. The other end is open and is the fluid inlet. The fluid outlets are at the sides of the body. The body holds the spring and the poppet valve. The internal seal when the check valve is closed is from metal-to-metal contact between the poppet and the valve seat of the body.
R Sampling Valve Figure 023
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R Check Valves Figure 024
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R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
The system has two types of check valves:
-
the cartridge type,
-
the in-line type.
The cartridge type of check valve is installed in the HP and PTU manifolds. The valve has a stainless steel or aluminium alloy cylindrical body with a screw thread. One end of the body is closed and has a hexagonal head. The other end is open and is the fluid inlet. The fluid outlets are at the sides of the body. The body holds the spring and the poppet valve. The internal seal when the check valve is closed is from metal-to-metal contact between the poppet and the valve seat of the body.
**ON A/C ALL
The in-line check valve is the type which is used in all other installation positions. It has a cylindrical body made of stainless steel or aluminium alloy which holds the spring and poppet. The body has hydraulic connections at the two ends. The connections are of different dimensions to stop reversed installation of the valve. The internal seal of the valve when it is closed comes from metal-to-metal contact between the poppet and the valve seat of the body.
All of the in-line check valves have connections of different dimensions at their two ends. Thus, it is not possible to install them with the wrong direction of flow.
The two check valves 1041GM and 1050GM are different from the other in-line check valves. Because they are installed between the engine and the pylon, they are made so that high temperatures do not affect them. This is so that they will not fail if there is an engine fire. Their attachments are specially made so that it is not possible to install other check valves.
P. Compensated Slide 1010GM
R (Ref. Fig. 025) Couplings at the housing end and at the end termination connect the compensated slide assembly to the pipework of the hydraulic system. The housing end is screwed into the housing to make a cylinder for the piston. Temperature changes or movement of the wing which changes the length of the pipework is compensated in the unit with the movement of the piston.
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