Reversing the Failure Mode of a SAMSON 3271/3277 Actuator from Fail Open to Fail Close

INSTRUCTIONS

WARNING: Actuators with preloaded springs are under tension. They can be identified by three long bolts protruding from the bottom of the actuator. These should be removed last, and installed first upon re-assembly.

1. With the actuator removed from the valve, unscrew the nuts and bolts on the diaphragm case.
2. Lift off the top diaphragm case.
3. Remove the diaphragm plate assembly consisting of the diaphragm plate, diaphragm, and actuator stem from the actuator case.
4. Remove the springs.
5. Clamp the bottom section of the actuator stem into a vise using protective jaws, ensuring the actuator stem is not damaged.
6. Remove the collar nut.
7. Remove the diaphragm plate from the actuator stem, flip upside-down and place them back onto the actuator stem.
8. Re-install the collar nut.
9. If necessary, apply a suitable lubricant to the actuator stem.
10. Install the diaphragm plate assembly together with the actuator stem pointing downward into the bottom diaphragm case.
11. Place the springs onto the diaphragm plate, centering them in the intended recesses. The final actuator spring range will determine the appropriate springs to be installed.
12. Place the top of the actuator case onto the assembly. Ensure that the air connections on the cases are correctly aligned with each other.
13. Fasten the top and bottom diaphragm cases together using the nuts and bolts. Observe tightening torques.

ABOUT THE SAMSON 3271/3277

The Type 3271 pneumatic rolling diaphragm actuator is designed for all industrial applications. This actuator is a linear motion device ideal for valve sizes ranging from the micro-flow valves to large 20"+ globe control valves.

The Type 3277 pneumatic rolling diaphragm actuator with an integrated accessory attachment area is designed for all industrial applications. This actuator is a linear motion device ideal for valve sizes ranging from the micro-flow valves to 4" globe control valves.

The thrust force of the actuator depends on the actuator area, pneumatic supply pressure, spring stiffness, distance traveled, initial compression of the spring, the number of springs internal to the actuator, etc.

The Type 3271 and Type 3277 Pneumatic Actuators contain a rolling diaphragm and internal springs and have the following special features:

• Low overall height
• Powerful thrust at high stroking speed
• Low friction
• Various bench ranges by varying the number of springs or
• their compression
• No special tools required to change the bench range or to
• reverse the direction of action (also version with handwheel)
• Permissible operating temperatures from –60 to +120 °C

For more information on SAMSON Controls, contact Ives Equipment by calling 877-768-1600 or visiting https://ivesequipment.com.

Qualified US Navy Supplier of Valves, Instrumentation, and Analyzers

Ives Equipment, headquartered in King of Prussia, PA, is a qualified US Navy supplier of valves, instrumentation, and analyzers.

As an authorized ASCO, Worcester Valve, Niagara Meter (Venture Measurement), Siemens, and REOTEMP, Ives Equipment is registered under Cage Codes 1H855 and 6F024.

Ives Equipment provides the United State Navy with these products:

• Manual ball valves ¼” through 2”
• Pneumatic and electric control valves 1” through 2”
• Flowmeters ½” through 12”
• Solenoid valves all sizes 
• Dual temperature elements
• Pressure transmitters
• Temperature transmitters
• Boiler cameras
• RTD assemblies

Ives Equipment products meet the following United States Military Standards:

• MIL-STD-167 valves
• MIL-STD-167 flow meters
• Mil-Spec qualified high shock MIL-901D
• MIL-SPEC Pneumatic and electric control valves

Services provided to the US Navy include:

• Complete project management / engineering for ShipAlt and MachAlt projects.
• Wide variety or instrumentation and valving approved to Mil Spec Mil-S-901D Grade A and Mil-STD-167-1.
• Comprehensive solutions engineering for shipboard applications.
• Successful shipboard engineering solutions within steam machinery, chilled water, bleed air, refrigeration HVAC, life safety.

Manufacturers:

ASCO Valve Authorized Navy Distributor - ASCO designs and manufactures quality solenoid valves to control the flow of air, gas, water, oil and steam. ASCO's Navy/Marine product line represents a select line of valves designed to meet US Navy specifications.

SIEMENS - Pressure, differential pressure, temperature and level transmitters for US Navy ships.

Worcester Valve (Division of Flowserve) - Having earned a reputation over 45 years for high performance and reliability, Worcester ball valves are installed on submarines and surface ships throughout the world. Their product range of materials includes Nickel Aluminum Bronze (NAB), Monel and Titanium.

Niagara Meters (Venture Measurement) - Niagara Meters is known for their robust and proven flow meter designs. Niagara Meters’ flow meter technology is used by the US Navy for operation on naval ships. Niagara Meters is proud to be a company built on innovation and reliability for which the brand has become known.

REOTEMP - Resistance temperature detector (RTD) assemblies used aboard US Navy ships.