The altitude valve is furnished fully factory assembled except for the tank sense line. In areas where freezing temperatures are possible, the valve should be located in a vault below the frost line.

After the main valve is installed, the tank sense line must be connected at the altitude pilot. The proper installation of this sense line is critical to the efficient operation of the altitude valve. The following guidelines apply.

1. It is essential that the sense line be connected as close to the tank as possible in order to accurately sense the tank head, within 40 diameters of the tank wall or riser.
2. Minimum recommended size for the sense line is €" OD tubing or 3/8" pipe.
3. In order to prevent air accumulation, the sense line should slope slightly upwards from the valve to the tank.

The altitude valve vents its diaphragm chamber to atmosphere, the volume varying according to valve size, as shown below. Provision should be made to drain off or otherwise dispose of this water.

1 1/4"	0.02 gal.	3"	0.1 gal.	10"	2.5 gal.	24"	28.0 gal.
1 1/2"	0.02 gal.	4"	0.2 gal.	12"	4.0 gal.
2"	0.05 gal.	6"	0.6 gal.	14"	6.5 gal.
2 1/2"	0.06 gal.	8"	1.0 gal.	16"	9.6 gal.

1. Adjusting Screw
2. Spring
3. Upper Diaphragm Chamber
4. Lower Diaphragm Chamber
5. Pilot Valve Body
6. To Bonnet
7. To Supply
8. To Atmosphere
9. Tank Pressure Sense Line