background image

CAUTION :

1.

 

Use pressure relief valves for high pressure    

 piping.

2. 

Use explosion proof valves/accessories for   

 

dangerous media piping.

3. 

Use fire safe valves for piping where chances of  

 

fire by external means.

4. 

Use seismic proof valves where chances of    

 

earthquake are frequent.

5. 

Check whether location of the valve mounting is  

 

of the same service/application as specified on  

 

the marking plate.

Installation, Operation,

Maintenance Instructions

VFlo

Control Valves

Содержание VFlo

Страница 1: ...ping 3 Use fire safe valves for piping where chances of fire by external means 4 Use seismic proof valves where chances of earthquake are frequent 5 Check whether location of the valve mounting is of the same service application as specified on the marking plate Installation Operation Maintenance Instructions VFlo Control Valves ...

Страница 2: ...s not paid to this factor On observation of damage in transit shipper should be contacted immediately The Mascot representative is always at your service whenever needed Quick Check Before beginning check the control valve as per the steps mentioned below By making the appropriate instrument signal change verify for full stroke The position indicator plate is mounted on the actuator transfer case ...

Страница 3: ...ge In case an actuator is attached the appropriate maintenance instructions for preventive maintenance need to be referred Where possible remove the air supply to observe the actuator stroke plate for correct fail safe action Ensure fastening of all valve accessories brackets and bolting The exposed portion of the valve shaft must be free from dirt or foreign material I case an air filter is prese...

Страница 4: ... removing it the set screws in the lock ring need removal then the re taining ring is to be removed lock ring and seal retainer finally The retaining ring can be forced out using a flat headed screwdriver and pliers if the lock ring set screws do not loosen Remove the seals By removing both packing nuts remove the gland flange Removing the studs is not necessary On rotating post designs both the s...

Страница 5: ... by lowering it splined hole first into the back of the body Rotate the ball surface toward the front of the body so that the splined hole is towards the packing box CAUTION Whilst Replacing it in body be extremely careful not to scratch or gall the sealing surface of the ball Scratches may cause excessive leakage and wearing of seal For 3 through 12 inch designs the shaft is to be inserted throug...

Страница 6: ...e body There is only one seal ring for 1 designs For screwed in retainer designs replace the O rings in the retainer except on high temperature valves which do not use O rings Figure 1 or 2 should be referred The retainer threads and rings are to be lubricated and reinstall the retainer in the front of the body Torque the seal retainer according to Table III For some 10 and 12 inch valves where th...

Страница 7: ...y 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 sil...

Страница 8: ...MASCOT VALVES PVT LTD 166 167 G I D C Naroda Ahmedabad 382330 India Phone 91 79 22821619 22823369 Fax 91 79 22822430 Email info mascotvalves com web www mascotvalves com ...

Отзывы: