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PVDF valves are furnished with Metric pipe size spigots. These spigot ends are sized to either be used with socket fittings or fusion welded directly into the lines. In all cases follow the recommended fusion joining instructions of the Fusion joining machine’s manufacturer.

ACTUATOR CONNECTION:

On all 1/2” (15mm) air actuated diaphragm valves and 3/4” (20mm) air to open / air to close actuated diaphragm valves the air connection is a 1/8” NPT. All other air actuators have 1/4” NPT air connections. The bottom connection opens the valve. The top connection closes the valve.

REPAIR:

Maintenance on the diaphragm valves is generally limited to the replacement of the diaphragms . The diaphragm life is effected by application and frequency of cycle.

EXTREME CAUTION MUST BE TAKEN WHEN WORKING ON THIS VALVE. THE PIPING SYSTEM MUST BE DEPRESSURIZED AND DRAINED. PROPER CARE MUST BE TAKEN. CONSULT M.S.D.S. (MATERIAL SAFETY DATA SHEETS) INFORMATION REGARDING YOUR SPECIFIC APPLICATION.

There is no need to remove the valve from the line to replace the diaphragm. Four bolts hold the bonnet to the valve body, sandwiching the diaphragm. The diaphragm and end connector o-ring material should be selected for compatibility with the specific application. Open the valve. This may require application of air pressure to the actuator on fail-close design actuators. Remove the four bolts (See Detail drawing) and where applicable the washers under the bolts. Remove the bonnet with the diaphragm. Remove the air pressure from fail close actuators or rotate the handle to extent the compressor to allow access to the diaphragm. • On 1/2” (15mm) and 3/4” (20mm) valves the diaphragm snaps into the bonnet assembly. Remove the diaphragm by pealing it out of the compressor. Inspect the diaphragm for wear and replace as needed. Make sure the holes in the diaphragm align with the holes in the bonnet. The line on the diaphragm will align with the weir in the body. • On all other diaphragm valves the diaphragm has a right hand thread. Unscrew the diaphragm by rotating it counterclockwise from the compressor. Inspect the diaphragm for wear and replace as needed. Make sure the holes in the diaphragm align with the holes in the bonnet. The identification tab on the diaphragm will align with the weir in the body. In most applications the diaphragm life can be greatly increased by the application of a small amount of silicon lubricant on the compressor side of the diaphragm. Install the four bolts and washers to the recommended torque below.

Diaphragm Valves 1/2" to 2" - 16511 MANUAL VALVE ACTUATED VALVE

BODY BOLT TORQUE SIZE TORQUE INCH*LBS RUBBER DIAPHRAGM TORQUE INCH*LBS TEFLON DIAPHRAGM 1/2” (15MM) 40 55 3/4” (20MM) 40 55 1” (25MM) 70 80 1 1/2”(40MM) 100 120 2” (50MM) 100 120

DVIN REV C 8/18/99 ECR 819R

TEMPERATURE VS USABLE PRESSURE