1 Series 2700A Control Valve Operation and Maintenance INTRODUCTION WARNING. Maximum allowable pressures for the Valve body and Scope actuator and the maximum allowable pressure at the maximum temperature for the Valve are shown on the This instruction manual includes installation, Operation and nameplate mounted on the actuator. If pressure to the maintenance information for 1" through 8" Norriseal Series Valve is capable of exceeding these limits, install relief 2700A Control valves . Please refer to separate manuals for valves or other over-pressure protection devices in the instructions covering controllers and positioners. pressure lines. CAUTION. Description When ordered, the Valve configuration and construction The Series 2700A Valve is designed for general purpose use materials were selected to meet particular pressure, in liquid and gas Control applications calling for modulating temperature, pressure drop, and fluid conditions.
2 Since or on/off service. The Series 2700A has a single-port body some body/trim material combinations are limited in with two types of balanced trim, Plug Control and Cage their pressure drop and temperature ranges, do not apply Control . The pneumatic Spring/Diaphragm Actuator has the any other conditions to the Valve without first contacting Spring in the Yoke under the Diaphragm for both direct the Norriseal sales office or your sales representative. (spring opening) and reverse (spring closing) acting modes. The Balanced Plug Control trim is used with the fluid Valve INSTALLATION AND START-UP. flowing up under the characterized Valve plug. Fluid pressure drop occurs at the flow area between plug and seat. The contour on the plug characterizes flow versus lift. 1. Before installing the Valve , inspect it for any shipment damage and for any foreign material that may have The Balanced Cage Control trim is used with fluid flowing collected during crating and shipment.
3 Remove flange either down or up, depending on the application, through the protectors from body end connections. characterized ports in the cage. Fluid pressure drop occurs at the flow area of the cage's port with the port's contour 2. Blow out all pipelines to remove pipe scale, chips, characterizing flow versus lift. welding slag, and other foreign materials. Norriseal valves are equipped with pneumatic actuators, 3. Install Valve so that flow is in the direction indicated either reverse acting (spring closing) or direct acting (spring by flow direction arrow either cast on the body or on a opening) type. Both actuator types are available in a range tag pinned to the body. of sizes and with a selection of springs to suit operating 4. Install Valve using good piping practice. For flanged conditions. bodies, use a suitable gasket between the body and The Series 2700A valves are available with either adjustable pipeline flanges.
4 For threaded (NPT) bodies, use TFE. or non-adjustable packing. The non-adjustable packing is tape or pipe thread sealant on external pipe threads. "V" ring style with a spring below the packing to maintain a For smooth Operation , Valve should be installed in an load. The adjustable style is square compression packing. upright position with actuator vertical above the body. Both packing styles are retained with two studs holding a 5. The bodies are rated ANSI 150, 300, 600, 900, 1500 or compressor bar on the packing retainer. The Series 2700A 2500 class. Do not install Valve in a system where the bonnets have an NPT thread for mounting an optional working pressures can exceed those marked on the packing lubricator. nameplate. 6. Connect instrument air to actuator or positioner Valve Identification connection. Refer to nameplate for maximum A Valve nameplate is attached to the upper diaphragm instrument air pressure.
5 Check for proper Valve housing of each Valve assembly. The nameplate lists the Operation by cycling actuator several times and serial number, Series number and model number as well as observing stem movement. other information applicable to the particular Valve assembly, including trim size, trim and plug materials, and pressure and temperature limits. Valve model numbers are 13 positions long; with a typical model number being RF-14 AFDCT9NO. Table 1 relates model number positions to Valve configuration. Always refer to Series and model numbers, for the Valve nameplate, when ordering replacement parts. Maintained by: Sales Department Page 1 of 9 Doc. Name: Approved by: Quality Department Rev.: C Date: 31-Mar-04. Series 2700A Control Valve Operation and Maintenance Stem travels for valves with full size trim are listed below. Table 1. MODEL NUMBER POSITIONS. For valves with restricted trim, stem travel may be less Table 1 lists model number positions with descriptions and than the value shown.
6 Some common codes and definitions. For valves with model codes different from those listed, consult factory. BODY SIZE STEM TRAVEL. (IN.) (IN.). 1 EXAMPLE: 1. 2 MODEL NUMBER R F - 1 4 A F D. 3 POSITION NUMBERS 1 2 3 4 5 6 7 8. 4 2. 6 8 4 POS. DESCRIPTION CODE CODE DESCRIPTION. S THREADED,NPT. RF RAISED FACE FLANGE (ANSI). 7. Actuator springs are pre-set at the factory and may BODY END. 1&2 RJ RING JOINT FLANGE (ANSI. CONNECTION. require adjustment to suit specific operating B BUT WELD. conditions. To adjust actuator spring setting, proceed W SOCKET WELD. as follows Valve - STANDARD CONSTRUCKTION. 3. CONSTRUCTION N NACE(MR-0175)CONSTRUCTION. BODY 2 ANSI 150 PSR CLASS, 290 PSIG. a) Reverse actuator: PRESSURE. 07 ANSI 300 PSR CLASS, 750 PSIG. Loosen lock nut on the stem below the spring, and RATING. (Specific WP 14 ANSI 600 PSR CLASS, 1500 PSIG. turn adjusting nut above it clockwise to increase the 4&5.)
7 Depends on body 21 ANSI 900 PSR CLASS, 2250 PSIG. spring's pre-load and plug seating force to achieve mat';. tighter shutoff. Turn adjusting nut counterclockwise pressures shown are 36 ANSI 1500 PSR CLASS, 3750 PSIG. to reduce preload. Re-tighten lock nut after for WCC steel) 60 ANSI 2500 PSR CLASS, 6250 PSIG. A STANDARD. adjustment. 6 BONNET TYPE. E EXTENDED. Note: An increase in plug seating force will also W WCC. BODY and F CF8M. increase diaphragm supply pressure required to fully 7 BONNET. L LCB. open the Valve . MATERIAL. J WC6. INNER SEAL B 316L-GRAFOIL/NITRILE/ b)Direct actuator: MATERIALS. D. 316L-MGB/FLUOROCARBON/ 8 (gaskets/Plug 316L-MGB/RYTON/PEEK/RYTON. Loosen lock nut on the adjusting nut below the spring, Seal/Back-up Ring G INCONEL- and turn adjusting nut clockwise to increase the Bearing Ring) J spring's pre-load and turn it counterclockwise to A TFE V-RING, SPRING LOADED, NON-ADJ.
8 STEM PACKING. reduce the pre-load. Re-tighten lock nut after 9 C TFE/GRAPHITE (Braided), ADJ. TYPE. adjustment. D GRAFOIL, ADJ. ACTUATOR B DIRECT (Spring to open). 10. Note: In a direct actuator, any increase in supply TYPE T REVERSE (spring to Close). pressure to diaphragm produces a corresponding 9 No. 9, 35 Sq." ( " DIAMETER). ACTUATOR 2 No. 12, 70 Sq." ( " DIAMETER). increase in plug seating force, with Valve closed. 11. SIZE 6 No. 16, 120 Sq." ( " DIAMETER). 8 No. 18, 180 Sq." ( " DIAMETER). 12 ACTUATOR VARIES WITH Valve SIZE, TRIM. &13 SPRING CODE SIZE & ACTUATOR SIZE. Maintained by: Sales Department Page 2 of 9 Doc. Name: Approved by: Quality Department Rev.: C Date: 31-Mar-04. Series 2700A Control Valve Operation and Maintenance Valve MAINTENANCE Actuator Disassembly A. For reverse actuators (spring closing): WARNING. Before attempting any repairs, isolate the Control 1.
9 Remove instrument air from the actuator. Valve from the system and make sure that all pressure 2. Loosen lock nut on stem below the spring, and turn is released from Valve body. adjusting nut above it counterclockwise to 1. Isolate Valve from the process. completely remove the spring's pre-load. 2. Shut off operating lines to the actuator. 3. Unscrew the two hex-head cap screws on the stem 3. Release the process pressure. connector and remove the stem connector. 4. Vent the actuator loading pressure. 4. Remove yoke from bonnet, using a metal punch or narrow flat metal bar and hammer to unscrew the yoke lock nut. Valve parts are subject to normal wear and must be 5. Unscrew cap screws around the diaphragm housing inspected and replaced as necessary, with frequency of and remove the upper housing. inspection and maintenance depending upon severity of 6. Invert actuator and remove the lock nut and service conditions.
10 The following sections describe adjusting nut from the actuator stem. procedures for disassembling and re-assembling Valve for normal maintenance and troubleshooting. All maintenance 7. Remove diaphragm plate/diaphragm/stem assembly operations may be performed while the Valve body remains from yoke. in line. Table 2 lists the maintenance schedule for the Valve 8. Unscrew jam nut on top of actuator stem and assembly. Table 5 presents a chart for assistance in disassemble lock washer, diaphragm plate, troubleshooting Valve Operation . diaphragm, and actuator stem. 9. Remove actuator spring and lower spring retainer Table 2. MAINTENANCE SCHEDULE from yoke. Item Inspection Schedule Inspect every 6 months, under normal service B. For direct actuators (spring opening): conditions (low pressure drop and no sand or 1. Remove instrument air from the actuator. Valve Trim abrasives in fluid).