background image

  2.  If it is necessary to cut the cable to a shorter 

length, pull about one foot of inner cable from the 

Type N550 latch block cable end (end with the 3/16 

by 1/2-inches (4,8 by 13 mm) long cylindrical cast 

fitting, see Figure 3) from the housing.

At the remote release end (other end of inner 

cablehousing assembly), cut the housing and      

inner cable at desired length.  Push the excess 

inner cable back through the housing so that the 

bare cable extends from the remote release end.

  3.  Close the Type N550 valve.  Handle parallel to pipe.  
  4.  If necessary for additional working space, remove 

the long end of the external spring from under the 

latch block. 

 DO NOT REMOVE SPRING 

FROM HANDLE.  

  5.  Loosen the slotted screw, Figure 3, on the    

       Type N550 valve’s latch block until the plunger  

       can be pulled from the latch block.    
  6.  Disconnect the short looped cable and remove it. 
  7.  Insert the Type P164B inner cable end cylindrical  

       cast fitting through the latch block rear conical  

       hole and connect the cylindrical cast fitting into the  

       side slot in the plunger.  

 

  8.  Replace the plunger in the latch block, oriented 

so the screw will enter the plunger slot.  Tighten 

the screw. 

  9.  The end of the cable housing and cable housing 

nut fit into the conical end of the latch block.  

Pulling the excess inner cable through the housing 

from the remote release end will hold the housing 

in the latch block.    

  10.  Mount the remote release cylinder assembly to a  

suitable support at the remote release location 

[7/16-inch (11 mm) diameter mounting hole] but 

do not tighten the mounting nut.    

  11.  At the remote release end, strip about 3/4-inch 

(19 mm) of vinyl cover from the cable housing end. 

  12.  Insert the inner cable completely through the 

release cylinder.  Screw the bare cable housing 

end into the remote release cylinder by rotating 

the cylinder.  Tighten the mounting nut. 

  13.  Pull any slack from the inner cable, just tight 

enough so that the latch is not activated, and 

cut the inner cable off 1-inch 

(25 mm) past the 

remote release cylinder end.  

 

  14.  Insert the 1-inch (25 mm) bare inner cable  

         into the remote release handle shaft.  Push the  

         remote release handle completely into the   

         remote release cylinder.  Tighten the handle set  

         screw to secure the handle to the inner cable.

 

Figure 3.

  Type P164B Cable Release Installation Schematic

REMOTE RELEASE END

HANDLE

SET 

SCREW

REMOTE RELEASE CYLINDER

MOUNTING NUT

3/16 x 1/2 (4,8 x 13)  

CYLINDRICAL

CAST FITTING

CABLE 

HOUSING NUT

TYPE N550 

LATCH

BLOCK END

CLAMP

CLAMP

PLUNGER

SLOTTED PLUNGER SCREW

(25)

INCHES 

(mm)

4

Type N550

Summary of Contents for Fisher Snappy Joe N550

Page 1: ...ntended for in line use on LP Gas or Anhydrous Ammonia NH3 service The valves may be installed on both ends of transfer hoses where the hose connects the bulk plant piping to the bobtail transport or tank car They provide a quick way of shutting off gas flow in the event of a hose rupture and meet the requirements for such service when correctly installed with a remote release and proper piping su...

Page 2: ...en a storage tank and the transfer hose connection at the truck or tank car loading unloading area They can be placed in a line used either for filling or withdrawing from the storage tank or both The valve shall be installed to shutoff flow from the tank towards the hose enabling the valve to control product loss in case of a hose break WARNING The Type N550 valves are spring closed aided by pres...

Page 3: ...de enough pull on the hose connection to cause a break in the system That break must not occur between the Type N550 and the storage tank Fusible Element Location A fusible element that will close the Type N550 shall be located within five feet of the hose connection If the Type N550 is placed within five feet of the hose connection this requirement is met If not an additional fusible element must...

Page 4: ... of the cable housing and cable housing nut fit into the conical end of the latch block Pulling the excess inner cable through the housing from the remote release end will hold the housing in the latch block 10 Mount the remote release cylinder assembly to a suitable support at the remote release location 7 16 inch 11 mm diameter mounting hole but do not tighten the mounting nut 11 At the remote r...

Page 5: ...e Type P327D see Figure 4 1 Close the Type N550 valve Handle is parallel to the pipe 2 Remove the long end of the external spring from under the latch block DO NOT REMOVE SPRING FROM HANDLE 3 Remove latch bolt s Older valves will have 2 bolts DISCARD CABLE LATCH BLOCK 4 Use a 5 32 inch 4 mm Allen head wrench to screw 1 4 inch 6 4 mm long bolt into bottom hole 5 Tighten until bolt head seats firmly...

Page 6: ... connection When the hose stretches more than the amount of slack left in the cable the tightening cable will pull the lever down and close the Type N550 valve CAUTION Possible hand and finger pinch point between closing Type N550 handle and latch block Handle closes quickly and with extreme force Keep hands and fingers away from handle as it closes 10 Test the remote release and Type N550 operati...

Page 7: ...epaired in the field However due to the special fire resistant seals and assembly techniques repairs should be done only by trained personnel If repair should become necessary contact your local LP Gas Equipment Distributor for information and assistance Only parts manufactured by Emerson Process Management Regulator Technologies Inc should be used for the repair of Fisher Type N550 Valves Be sure...

Page 8: ...eel T12851T0012 29 Washer Carbon steel 2 Required T1207524082 30 Packing Stack T12854T0012 31 Follower 174 Stainless steel T12841T0012 32 Retainer Steel T20674T0012 33 Bolt Stainless steel 2 Required T12499T0012 34 Bushing T12551T0012 35 Washer Nylon PA T12781T0012 36 Latch Block Aluminum T13800T0012 37 Spring 302 Stainless steel T13877T0012 38 Plunger Polyester T12846T0012 39 Cable T12849T0012 40...

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