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M&H 4500, Руководство пользователя

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Page 6 of 27 

 

IMPORTANT

 – Do not remove a BFV operator while under flow and pressure. Without 

an operator in place holding the vane, a BFV will try to close in the presence of flow and 
can create a hazardous water hammer situation. Also, the operator may serve to retain 
shaft seals, which could be ejected without the operator mounted on the valve.  

  

Valves equipped with manual operators for open, close, or throttling service generally do not require 

preventative maintenance. Operator settings are adjusted during the assembly process and tested at full 
closure; thus an operator adjustment is rarely required. Consult the specific manufacturer to obtain 
detailed information regarding the maintenance of each type of operator provided.   

  
 

SECTION 1.7 – AUTOMATION  

Selection of a valve type for automation includes numerous application specific considerations. From a 

cost standpoint, a quarter turn BFV is generally more economical to automate than a multi turn gate valve.  

  

Manufacturers can provide automation to suit virtually all control even those with very specific design 

criteria. When specifying, pricing, or ordering automated valves, the information required includes 
pressure & velocity, open/close or modulating service, available power supply, control requirements, and 
type of protective enclosure. A data sheet that more fully covers application conditions is available on the 
following page.  

  

For automation of existing manual operator installations, it is suggested to contact an area operator 

representative to determine and provide for those specific needs.   

  

Variable degrees of preventative maintenance will be required based on the type of equipment and its 

application. Consult the manufacturer of the operator for service information including required 
preventative maintenance and detailed service procedures.  

 
 

SECTION 1.8 – COATINGS  

M&H standard coating for BFVs is fusion bonded epoxy meeting the requirements of AWWA C550, 

Protective Epoxy Interior Coatings for Valves and Hydrants and NSF61, Drinking Water System 
Components.  In certain cases, two-part sprayed-on epoxy may be used meeting the same requirements.   

 
OPEN LEFT Operating Nuts and Handwheels are coated with black fusion bonded epoxy.  
OPEN RIGHT Operating Nuts and Handwheels are coated with red fusion bonded epoxy. 
  

 

 

 

Содержание 4500

Страница 1: ...M H VALVE COMPANY AWWA C504 00 BUTTERFLY VALVES CLASS 150 250 SIZES 3 THRU 72...

Страница 2: ...2 3 Installation Safety 9 2 4 Inside Diameter of Mating Pipe 9 2 4D Mating Pipe Inside Diameter Drawing 10 2 5 Pipe Connection 11 2 5 1 Mechanical Joint Follower Glands 11 2 5 2 Flanged End Connection...

Страница 3: ...Seat Ring 21 5 3 2 2 30 thru 72 Installation of New Vane Seat Ring 22 5 3 2 3 Service Details 22 5 4 M H BFV Traveling Nut Operator 23 5 4 1 General 23 5 4 2 External Obstruction 23 5 4 3 Internal to...

Страница 4: ...u 20 Mechanical joint x flanged ends are generally produced up to the 16 size Rubber seated butterfly valves are designed to provide a 100 shut off at operating pressures in accordance with AWWA C504...

Страница 5: ...lity without disassembly of the shaft vane assembly SECTION 1 5 SHAFT VANE DESIGN AWWA C504 covers the use of either a single piece shaft or a two piece stub shaft A single piece shaft is common for t...

Страница 6: ...se with very specific design criteria When specifying pricing or ordering automated valves the information required includes pressure velocity open close or modulating service available power supply c...

Страница 7: ...ating Maximum Temp Type Motor Weather explosion proof Etc Type of Reversing Controller Nema Class Type of Pushbutton Station Nema Class Pushbutton Station Control Voltage Special Requirements Suggeste...

Страница 8: ...cally retained seat on the vane provides for adjustment or replacement with relative ease It is recommended that BFVs be installed with the seat side positioned for best access to the seat for future...

Страница 9: ...her applicable standards Individual states may have more stringent regulations Contact the appropriate state agency before any work is begun for additional information and any potential permitting req...

Страница 10: ...Page 10 of 27...

Страница 11: ...e torque on the nuts should be uniform utilizing an alternating star pattern with as many as five repetitions of tightening to assure even torque stress c The MJ bolts should be torqued in accordance...

Страница 12: ...Page 12 of 27...

Страница 13: ...1 9 16 1 1 8 7 UNC 4 20 1 11 16 1 1 8 7 UNC 4 24 1 7 8 1 1 4 7 UNC 4 30 2 1 8 1 1 4 7 UNC 4 DOM 8 IMP 36 2 3 8 1 1 2 6 UNC 4 DOM 6 IMP 42 2 5 8 1 1 2 6 UNC 4 48 2 3 4 1 1 2 6 UNC 8 54 3 1 3 4 5 UNC 1...

Страница 14: ...ar a bend in a pipeline without proper adequate restraint to support the valve and prevent it from blowing off the end of the line It is good engineering practice to consider whether or not thrust blo...

Страница 15: ...s that Foreign material left in pipeline during installation often results in valve or hydrant leakage during pressure testing This remains a common cause of testing failure relating to valves hydrant...

Страница 16: ...t the requirements of AWWA C504 Class 150B Requirements for higher pressure rated valves such as CL 250B must be specifically noted at the time of purchase Leakage for pipeline testing is defined as t...

Страница 17: ...d before actuating the valves SECTION 4 3 THROTTLING The M H traveling nut operator is designed hold in place at any intermediate position and not allowing line flow to move the vane Throttling operat...

Страница 18: ...450 butterfly valves BFV are sized to meet requirements of AWWA C504 CL150B Standard applications utilize the following operators SIZE MODEL TURNS 3 THRU 12 FA12 29 14 THRU 20 1250 FA16 48 24 2200 FA2...

Страница 19: ...he appropriate state agency before any work is begun for additional information and any potential permitting requirements SECTION 5 2 VANE SEAT RING ADJUSTMENT Sizes 3 thru 72 1 If there is a small le...

Страница 20: ...th vane in the closed position remove seat retention screws 2 Open valve approximately 20 degrees to remove the seat NOTE For 3 thru 24 valves the Vane Ring Rubber is molded to the stainless steel ins...

Страница 21: ...ot hold pressure then consult the factory 5 For 14 thru 24 BFVs a Set the torque wrench to 160in lbs torque all of the bolts down to 160in lbs in an alternating star pattern as shown in the picture be...

Страница 22: ...tly work the Vane Seat Ring free keeping in mind that resistance may be encountered at areas of contact near the shaft locations Forcible removal may damage the seat and prohibit reuse if desired 6 Cl...

Страница 23: ...ated pressure then the process is done e If the valve does not hold increase the setting on the torque wrench to 220in lbs and a repeat the process f If the valve holds the rated pressure then the pro...

Страница 24: ...rence due to backfill material becoming wedged between the op nut and thrust plate Binding can be checked by removing or loosening the operating nut 3 An improperly fitted operating nut may cause it t...

Страница 25: ...has good movement from the Open position but binds as it approaches the Closed Position it is likely that there is an obstruction in the line preventing the valve from fully closing 5 The only way to...

Страница 26: ...lace 6 Move the vane out of the seat area and then back into the seat to confirm that the adjustment leveled the vane Section 5 5 3 Vane Level Adjustment Procedure for 48 thru 72 BFVs M H does not man...

Страница 27: ...e ground use it is easily painted over to match customer piping paint schemes 2 In some instances M H will use TNEMEC Pota Pox N141 two part epoxy N141 is NSF61 and UL approved and meeting the require...

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