The seal may be accessed by removing the bearing housing. See Disassembly, Steps , page 4. Remove any flush or barrier fluid tubes connected to the seal gland. Loosen setscrews on the seal collar to free the cartridge seal from the shaft. Remove the two gland capscrews and slide the cartridge seal out through the bearing housing opening.
If the pump is to be disassembled further, refer to Disassembly, page 4. Loosen nuts and remove seal plate, seal plate holder, seal seat and seal gasket s. Loosen setscrew in set collar bellows or mechanical seal rotary member wedge.
The remainder of the mechanical seal may be removed in conjunction with Step 7 of Disassembly, page 4. Inspect shaft for burrs and remove any found with a fine grade of emery cloth. Clean rotor shaft and face of seal chamber. Place tapered installation sleeve on shaft. Coat rotor shaft, tapered installation sleeve, and O-ring in the inside diameter of cartridge seal sleeve with a generous amount of light oil.
Refer to Figure 8. Slide cartridge seal over installation sleeve on shaft until it contacts the seal chamber face. Remove tapered installation sleeve from shaft. NUT 5. Follow steps on page 6 under Assembly. Insert gland capscrews and secure gland to bracket face. NOTE: Turn shaft several turns while gland is loose to center seal; then tighten gland tight enough to compress gasket. Tighten only enough to contain leakage and not to distort gland.
Lock cartridge seal drive collar to shaft and remove or turn centering clips out of the way so as to clear the drive collar. Turn shaft by hand or jog motor to check drive collar for runout. Connect flush line or vent stuffing box seals without flush line until liquid is present on start up. NOTE: For maximum seal life, flush line should be used. Clean rotor shaft and seal housing bore. Make sure they are free of dirt, grit and scratches. Gently radius leading edge of shaft diameter over which seal is to be placed.
NOTE: Never touch mechanical seal faces with anything except clean hands or clean cloth. Minute particles can scratch the seal faces and cause leakage. Place tapered installation sleeve on the shaft See Figure Coat outside of tapered installation sleeve and inside of rotary member of the seal with a generous quantity of light oil.
Grease is not recommended. Start rotary member on shaft including seat collar and screws on bellows seal and ease over tapered sleeve See Figure Flush sealing faces of both rotary member and seal seat with oil and press seal seat in to bore until back, unlapped face, is flush with bore. Install seal holder, seal plate, capscrews, and nuts and tighten securely. Connect flush line or vent stuffing box for seals without flush line until liquid is present on start up.
For complete pump assembly instructions, see Assembly, page 5. Remove tapered installation sleeve. Move rotary member so set screws are directly below seal access holes on side of bracket See Figure 9, page 7 and Figure Tighten all setscrews securely to shaft. Install other seal gasket, seal holder, seal plate, capscrews and nuts and fasten securely.
Remove holding clips to release springs after seal is installed on shaft. Loosen the two set screws in the outer face of the bearing housing and turn this thrust bearing assembly clockwise until it can no longer be turned by hand. Back off counter-clockwise until the rotor shaft can be turned by hand with a slight noticeable drag. For standard end clearance, back off the thrust bearing assembly the required length measured on the outside diameter of the bearing housing.
See Table 1, page 9. Your pump is now set with standard end clearances and locked. NOTE: Be sure the shaft can rotate freely. If not, back off additional length on outside diameter and check again. High viscosity liquids required additional end clearances. The amount of extra end clearance depends on the viscosity of the liquid pumped. For specific recommendations, consult the factory. Table 1 shows the additional bearing housing adjustment required for.
These bushings must be installed by a shrink fit. Install cool bushing with a press. Consult factory with specific questions on high temperature applications. Valve Cap 6. Valve Body 2. Adjusting Screw 7. Valve Spring 3. Lock Nut 8. Poppet 4.
Spring Guide 9. Cap Gasket 5. Bonnet A A. Carbon graphite is a brittle material and easily cracked. If cracked, the bushing will quickly disintegrate. Using a lubricant and adding a chamfer on the bushing and the mating part will help in installation. The additional precautions listed below must be followed for proper installation. A press must be used for installation. Be certain bushing is started straight. Do not stop pressing operation until bushing is in proper position. Starting and stopping will result in a cracked bushing.
Check bushing for cracks after installation. Jacketed Ports EC Certification Cleaning Pump Suggested Repair Tools Removal: O-Ring Seal Bushing Installation: O-Ring Seal Bushing Pump Disassembly Pump Assembly Thrust Bearing Adjustment Installation: Hardened Iron Idler Bushing Spacer Coupling Lengths Formerly TSM General Installation Notes Start Up Vacuum Gauge - Suction Port Pressure Gauge - Discharge Port Rapid Wear Preventative Maintenance Declaration of Conformity Viking Pump, Inc.
If the pump is mounted on a base plate, the base plate must be used for all lifting purposes. If slings are used for lifting, they must be safely and securely attached. DO NOT attempt to dismantle a pressure relief valve that has not had the spring pressure relieved or is mounted on a pump that is operating. Certain operating conditions, temperature control devices jackets, heat-tracing, etc. This may be provided through a relief valve mounted directly on the pump, an in-line pressure relief valve, a torque limiting device, or a rupture disk.
If pump rotation may be reversed during operation, pressure protection must be provided on both sides of pump. Relief valve adjusting screw caps must always point towards suction side of the pump. If pump rotation is reversed, position of the relief valve must be changed.
Pressure relief valves cannot be used to control pump flow or regulate discharge pressure. THE PUMP must be installed in a matter that allows safe access for routine maintenance and for inspection during operation to check for leakage and monitor pump operation. Internal type relief valves mounted on Viking pumps should always have the cap or bonnet pointed toward the suction side of the pump.
Return-to-tank-type relief valves should always be mounted on the discharge side of the pump. If pump rotation is reversed, change the relief valve.
Turn the internal type end for end; move the return-to-tank type to the other port. If, on a particular installation rotation is reversed, e. This may be a combination of relief valves, torque limiting devices or rupture disks.
Pumps or systems without relief valves should have some form of pressure protection, e. Viking pumps can be furnished with either an internal pressure relief valve - one which directs the flow from the valve back to the suction side of the pump - or a return-to-tank valve which directs the flow through piping back to the supply tank.
See Figures 5A and 5B. An inline relief valve mounted in the discharge piping also directs the flow back to the supply tank.
This type of valve should be mounted close to the pump so that the pressure drop through the piping between the pump and the valve is at a minimum. Be sure there are no shutoff valves between the pump and relief valve.
Piping from a return-to-tank or an in-line valve to the supply tank should also be as short and large as possible. NOTE: on some models the relief valve is mounted on the pump casing instead of the pump head. The spring loaded poppet-type valve is strictly a differential valve, sensing only those pressures on each side of the poppet.
It should not be used as a pressure or flow control device. It is intended strictly as a relief valve. The pressure at which either the return-to-tank or internal relief valve bypasses can be changed by turning the adjusting screw.
Do not back the adjusting screw all the way out. Stop when spring tension is off the screw the screw starts to turn easily. For details on maintenance of the relief valve see Technical Service Manual covering your model series. Motor - follow local electrical codes when hooking up motors.
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