Periodic Flowscanner Testing - Emerson Fisher SS-264 Instruction Manual

Instruction Manual
D103565X012
Note
M6 screws in steps 2 and 4 are tightened in torque units of inch•lbf and NOT ft•lbf, take care not to over-tighten.
2. Apply Loctite 242 (key 77) to M6 x 12 socket head cap screw and attach the namur disc to the actuator, tightening
to 10.2 N•m (90 in•lbf) with a 4 mm Allen wrench.
3. Attach each magnet to the trip arm assembly by using two 7/16­20 hex nuts, two 7/16 star washers, and two 7/16
plain washers as shown in figure 16, tightening to 47 N•m (35 ft•lbf) with a 11/16-inch wrench.
4. Apply Loctite 242 (key 77) to the two M6 x 20 socket head cap screws and attach the trip arm assembly with
magnets, cam, and pointer to the namur disc as shown in figure 15, tightening to 10.2 N•m (90 in•lbf) with a 5mm
Allen wrench.
5. Install each GO switch with a switch adaptor, 5/8 plain washer, 5/8 star washer and 5/8­18 hex nut to the bracket as
shown in figure 16, tightening to finger tight.
6. Apply Loctite 242 (key 77) to the standoffs and attach to the bracket as shown in figure 16, tightening to 1.9 N•m
(17 in•lbf) with a 1/4-inch wrench.
7. Attach the travel indicator scale to the standoff with 6­32 x 0.31 Philips pan head cap screws and No. 6 plain
washers, tightening to average mechanics torque with a Philips screw driver.
8. Attach the 3610J positioner to the mounting bracket with the four 5/16­18 x 0.75 cap screws as shown in figure 16.
Apply Loctite 242 (key 77) to the four 5/16­18 socket cap screws and tighten to 23 N•m (17 ft•lbf) with a 5/16 inch
Allen wrench.
9. Adjust the valve to the desired closed/open position.
10. With the valve in the desired closed/open position, line up the target magnet and GO Switch, and then establish a
4.06 mm (0.160 inch) – 5.08 mm (0.200 inch) gap between the ends of the GO switch and target magnet. Torque
the 5/8­18 hex nuts and switch adaptors to 47 N•m (35 lbf•lb).
11. Return the valve back to the closed/open position; line up the target magnet and GO switch. Then establish a 4.06
(0.160 inch) – 5.08 mm (0.200 inch) gap. Torque the 5/8­18 hex nuts and switch adaptors to 47 N•m (35 ft•lbf).

Periodic FlowScanner Testing

When the valve is operating at design pressure and temperature, it is recommended during regularly scheduled
cycling of the PV20 valve to perform FlowScanner testing to verify "break-in" ("ramp-in") and "break-out" torque to
verify proper seating and unseating of the ball. Figure 14 shows a FlowScanner plot, which identifies the expected
"ramp-in" of the upper (closing) line and the "break-out" or "jump" of the lower (opening) line of the ball out of the
seal. The ideal break-out torque pressure is between 26-30 psig, and an acceptable overall pressure range is 22-35 psig
based on PV20 testing of break-out profile and torque.
If these characteristics and the limits are met (both torque and pressure) in table 6, and Class V shutoff is achieved,
then the valve is considered as properly set. Adjustments to the travel stops can be made by following the Actuator
Adjustments section of this manual.
Table 6. Break -Out (Unseating) Upper and Lower Limits
Defined Limits
Required min. LL
Preferred min. LL
Preferred max. UL
Required max. UL
Torque (in•lbf)
11200
21000
28800
36600
SS-264 Valve
September 2021
Pressure (psig)
35.0
30.0
26.0
22.0
25