MASCOT VFlo, Инструкция по установке, эксплуатации и обслуживанию

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VFlo Control Valves
7
Entire actuator assembly is to be slided onto the shaft.
The yoke needs to be bolted to the valve body.
The actuator lever arm should be positioned on the shaft so
the actuator stem is centered in the transfer case.
The linkage bolt should be firmly tightened. Bolt the transfer
case cover plate into place.
Alignment of the stroke indicator plate to be done on the end
of spline lever so that it accurately indicates position of ball.
CAUTION : Without the cover plate installed; never apply
air to the actuator otherwise, the unsupported shaft is likely
to sustain damage.
The valve is to be installed in the line as outlined in the
"Installation" section.
Table IV: Optional VFlo Tools
Valve Retainer Shaft/Post
Size Tool Bearing Tool
1 87377 76891
1
1/
2
87530 76509
2 76112 76509
3 62295 75970
4 62294 75970
6 62296 81978 / 81974
8 62336 81978 / 81974
10 81775 76550 / 76551
12 81034 76550 / 76551
1.
2.
3.
4.
5.
6.
Gland Flange Stud
(Item No. 109)
Gland Flange Nut
(Item No. 117)
Half Ring
(Item No. 11)
Body
(Item No. 1)
Shaft
(Item No. 51)
End Plug
(Item No. 122)
End Plug O-ring
(Item No. 61)
Post
(Item No. 123)
Half Ring
(Item No. 11)
End Flange
(Item No. 10)
Post Pin
(Item No. 121)
Post Bearing
(Item No. 84)
Shaft Pin
(Item No. 52)
Ball
(Item No. 50)
Shaft Bearing
(Item No. 83)
Yoke Bolt
(Item No. 107)
Packing
(Item No. 88)
End Flange
(Item No. 10)
Seal Rings
(Item No. 20)
Soft Seal Insert
(Item No. 21)
Retainer O-ring
(Item No. 56)
Retainer O-ring
(Item No. 59)
Seal Retainer
(Item No. 30)
Packing Spacer
(Item No. 93)
Thrust Bearing
(Item No. 53)
Packing Follower
(Item No. 87)
Gland Flange
(Item No. 80)
Figure 5: Exploded Body Subassembly, 3", 12" and 16" VFlo
Note : Item numbers correspond to bill of material of Valve. Please refer to it for specific part numbers.
Failure Probable Cause Corrective Action
Valve moves to failure position, excessive air 1. Failure of actuator O-ring 1. Replace actuator stem O-ring
bleeding from transfer case 2. Failure of sliding seal assembly 2. Repair or replace stem adapter / linkage assembly
Jerky shaft rotation 1. Overtightened packing 1. Retighten packing box nuts to slightly over finger-tight
2. Improper adjustment of lever arm on shaft causing arm 2. Readjust lever arm (see step 1 in the
to contact transfer case thus failing to convert torque. “Remounting Actuator” section)
3. Cylinder wall not lubricated 3. Lubricate cylinder wall with silicone lubricant
4. Worn piston O-ring allowing piston to gall on cylinder wall 4. Replace O-ring; if galling has occurred replace all damaged parts
5. Worn actuator stem O-ring causing ctuator stem to gall on stem collar 5. Replace O-ring; if actuator stem is galled replace it
6. Worn (or damaged) shaft bearings, shaft bearings or packing followers 6. Disassemble and inspect parts; replace any worn or damaged parts
Excessive leakage through seal 1. Improper adjustment of external stroke stops 1. See “Adjusting External Stroke Stops” section
2. Worn or damaged seat 2. Replace seat
3. Damaged ball seating surface 3. Replace disc and shaft
4. Improper handwheel adjustment acting as limitstop 4. Adjust handwheel until disc seats properly
5. Ball not centered in body I.D. 5. Center ball; replace damaged seals.
Leakage through line flanges 1. Dirty line gasket surfaces 1. Clean gasket surfaces and reinstall valve
2. Improper torque on line flanges 2. Tighten line flanges evenly and completely (see Table 1 for proper torque)
3. Flange or pipe misalignment 3. Realign flanged ends with piping.
4. Warn Gaskets 4. Replace Gaskets
Leakage through packing box 1. Loose packing box nuts 1. Tighten packing box nuts to slightly over finger-tight
2. Worn or damaged packing 2. Replace packing
3. Dirty or corroded packing 3. Clean body bore and stem, replace packing
Valve slams, won’t open, or 1. Improper valve installation 1. See step 2 in “Installation” section and
causes severe water hammer correct flow direction
Shaft rotates, ball remains open or closed 1. Broken shaft 1. Replace shaft
Actuator operates, shaft does not rotate 1. Broken internal actuator parts 1. Refer to appropriate actuator Maintenance Instructions
Troubleshooting VFlo Valve