APTech KT12 - Manual (Page 2)

Operation Manual Piston Sensed Pressure Regulators
3. Inspect the regulator to determine the flow path through the regulator and how the regulator will
need to be installed in the system.
a. The high pressure (inlet/supply) port(s) is labeled with an “HP” marked on the body near the
port. Arrows are sometimes used next to the HP characters to point toward a high pressure
port.
b. The low pressure (outlet/delivery) port(s) is labeled with an “LP” marked on the body near
the port. Arrows are sometimes used next to the LP characters to point toward a low pressure
port.
c. Always connect the gas source to the high pressure port. Never connect the gas source to the
low pressure port as the regulator can be damaged and leakage can result.
Caution: If a regulator was installed incorrectly and a low pressure port was pressurized above the
rated outlet pressure, then the regulator must be returned to the factory for repair prior to use.
4. Install the regulator using the appropriate method described below. For assembly of other type
connections, consult connector manufacturer or contact the factory.
a. For NPT connections, apply PTFE (e.g. Teflon) tape to connector threads and install
connector in regulator body wrench tight.
b. For straight thread o-ring connections (such as MS33649 porting), verify the proper mating
fittings and o-rings are being used and install the fittings in the regulator. Tighten according
to fitting manufacturer specification.
c. For metal face seal connectors (Welded KT10), assemble connections per standard practice
described by fitting supplier (typically 1/8 turn past fingertight).
5. For pneumatically actuated KT10 and KT12 regulators, a separate line will need to be plumbed
to provide the pneumatic actuator control pressure. Pressurized inert gas, typically nitrogen gas,
or air may be used for actuation. The maximum allowable actuation control pressure is 100 psig.
The actuation port is 1/8
th
inch NPT and is located on the top center of the actuator. A pilot
regulator with an outlet pressure vent is recommended to control the actuation pressure.
6. If appropriate for the application, secure the regulator body using one of the below methods.
a. For KT10 and KT12 regulators with NPT or straight thread connections, use the panel mount
clamp option to secure the regulator. It may be necessary to remove the regulator wheel to
install the regulator through the panel. Refer to Figure 1 to remove closure, retaining ring,
wheel, and thrust washer. Refer to Figure 2 for panel mount clamp installation. Loosen the
10-32 screws on the clamp using a 5/32 inch hex wrench. Position the clamp on the regulator
body so the 1/4-20 UNC threaded holes line up with the panel cutout, then retighten the 10-
32 screws leaving the same gap between each half of the panel mount clamp. Install and
tighten 1/4-20 UNC screws (customer supplied) to secure regulator to panel. Reinstall the
thrust washer, wheel, retaining ring, and closure.
b. For Welded KT10 regulators with metal face seal connections, use the mounting holes in the
bottom of the body to secure the regulator with 10-32 UNF screws.
7. After installation, perform a leak test. A pressure decay leak test is recommended to check for
leak integrity of the regulator internal parts and external fitting connections. A bubble leak test
may be performed to check for leaks at external fitting connections. A helium leak test is
recommended for Welded KT10 regulators with face seal connections per standard industry
practice (reference SEMI standard F1).
Page 2 of 9 Manual 15000011 Rev. 5