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Instruction Manual
D104304X012
ATI Piston Actuator with Fisher
Contents
Introduction
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Scope of Manual
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Introduction
Scope of Manual
This manual provides installation, adjustment, maintenance, and parts list information for the Fisher ATI actuator
(figure 1). Refer to separate instruction manuals for information regarding the control valve and accessories.
Do not install, operate, or maintain an ATI actuator with Fisher NS2 Yoke without being fully trained and
qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal
injury or property damage, it is important to carefully read, understand, and follow all the contents of
this manual, including all safety cautions and warnings. If you have any questions about these
instructions, contact your
www.Fisher.com
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Emerson sales office
NS2 Yoke
™
Figure 1. ATI Actuator Assembly
before proceeding.
ATI Piston Actuator
June 2023
Table of Contents
Related Manuals for Emerson Fisher NS2 Yoke
Summary of Contents for Emerson Fisher NS2 Yoke
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Page 1: Table Of Contents
(figure 1). Refer to separate instruction manuals for information regarding the control valve and accessories. Do not install, operate, or maintain an ATI actuator with Fisher NS2 Yoke without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. -
Page 2: Description
CAP1400 nuclear applications. Specifications Tables 1 and 2 provide specifications for the ATI Actuator with Fisher NS2 Yoke discussed in this instruction manual torque values given are ±5% unless otherwise specified. See the actuator nameplate for specific information for your actuator. -
Page 3: Maximum Pressure Limitations
Instruction Manual ATI Piston Actuator D104304X012 June 2023 Maximum Pressure Limitations The piston of the ATI actuator is pressure operated. This air pressure provides energy to compress the spring, to stroke the actuator, and move the piston away from or towards the valve. The following explanations describe the maximum pressure limits for an actuator. -
Page 4: Lifting Valve/Actuator Assembly
Instruction Manual ATI Piston Actuator June 2023 D104304X012 NOTICE Care must be taken when lifting the valve/actuator assembly to ensure all accessories and tubing are not damaged in the process. Accessories and tubing may need to be removed prior to lifting to prevent damage and properly reinstalled before use. -
Page 5: Installation
Certain nonvertical orientations can cause water to collect in the yoke and actuator spring areas, eventually causing degradation in product performance. Note The ATI actuator with Fisher NS2 yoke is intended to mount directly to the valve bonnet. Mounting the Actuator on the Valve NOTICE The ATI SRE actuator spring load pushes the stem down out of the actuator yoke, and it can contact the valve stem during actuator mounting. -
Page 6: Installing The Travel Limit Switch Bracket
Instruction Manual ATI Piston Actuator June 2023 D104304X012 Installing the Travel Limit Switch Bracket Refer to figure 3 when installing the limit switch targets. 1. Apply Loctite ® 242 (key 185) to hex cap screws (key 147). 2. Attach the proximity switch target mounting bracket (key 148) to the stem connector half (key 103B) using the hex cap screws (key 147) and washers (key 146). -
Page 7: Replacement Of The Elastomeric Parts
Instruction Manual ATI Piston Actuator D104304X012 June 2023 D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment. D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the pipeline. -
Page 8: Assembly
Instruction Manual ATI Piston Actuator June 2023 D104304X012 6. For the SRE actuator, dial up the regulator output pressure until the stem connector (key 103) just barely begins to move up. For the SRR actuator, increase the pressure until the plug is seated, then back off on the pressure until the stem connector (key 103) just barely beings to move up. - Page 9 Instruction Manual ATI Piston Actuator D104304X012 June 2023 6. Lower the ATI Actuator assembly onto the mounting studs (key 101), make sure that the Fisher logo on the yoke is aligned to the Fisher logo on the valve body. Note The following two steps require a calibrated torque wrench up to 1356 N•m (1,000 ft•lbf) for SRE actuators and up to 407 N•m (300 ft•lbf) for SRR actuators.
- Page 10 NOTICE Care should be used when engaging the threads, any cross-threading should be avoided, as this may require replacing the ATI assembly or the valve stem assembly. If cross-threading has occurred, contact your Emerson sales office for guidance. Note To avoid cross-threading, ensure that the bolt half (key 103A) threads are engaged by pressing against the threaded piston rod as the first step in tightening, then align the nut half (key 103B) to the other side.
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Page 11: Troubleshooting
If leakage is from ATI seals, replace ATI assembly. Ensure stem connector is assembled as specified. Air leakage Inspect valve, see EWNS instruction manual (D103551X012) or HPNS instruction manual (D103466X012). Inspect all air connections for leakage Other Contact Emerson sales office if more assistance is needed. - Page 12 Instruction Manual ATI Piston Actuator June 2023 D104304X012 Figure 3. Fisher Size 80 Yoke/ATI Assembly E1711 Figure 4. Fisher Size 80 Yoke/ATI Disassembly/Assembly Air Connection HOSE BALL VALVE THREE-WAY (ISOLATION) BALL VALVE (FOR VENTING) PLANT REGULATOR AIR IN E1712...
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Page 13: Parts Ordering
WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson should not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the performance of the valve, and could cause personal injury and property damage. - Page 14 Instruction Manual ATI Piston Actuator June 2023 D104304X012 Table 4. ATI Assembly with Fisher NS2 Size 80A and 80C Yoke ACTUATOR SIZE VALVE SIZE, NPS PART NUMBER ATI with 80A NS2 Yoke 10x14 GH10437X022 20x16 GE86793X022 ATI with 80C NS2 Yoke 22x16 GE86793X042 Table 5.
- Page 15 Instruction Manual ATI Piston Actuator D104304X012 June 2023...
- Page 16 Fisher is a mark owned by one of the companies in the Emerson business unit of Emerson Electric Co. Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co.