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Cast Steel Gate Valve
| Size | 2"~60" |
| Rating | 150LB~2500LB |
| Body Materials | Carbon Steel, Stainless Steel, Alloy Steel, Duplex S.S. XDSS, etc. |
| Design Standards | API 600 |
| Face to Face Standards | ASME B16.10 |
| Flange Dimension Standards | ASME B 16.5, ASME B16.47 |
| Pressure Test Standards | API 598, API 6D |
| Quality/Product Certifications | ISO9001, ISO14001, ISO18001 |
| Fugitive Emissions | ISO 15848-1, API 622 |
| NACE | NACE MR 0103 NACE MR 0175 |
| Shutoff Class | API 598 (Zero Leakage), API 6D |
| End Connection | RF, RTJ, BW |
| Operation | Handwheel, Gear, Motor |
| NO. | PAPT NAME | MATERIAL-ASTM |  |
| 1 | BODY | ASTM A351 CF8 | |
| 2 | WEDGE | ASTM A351 CF8 | |
| 3 | STEM | ASTM A182 F304 | |
| 4 | BOLTS | ASTM A193 B8 | |
| 5 | NUTS | ASTM A194 8 | |
| 6 | GASKET | SS304 GRAPHITE | |
| 7 | BONNET | ASTM A351 CF8 | |
| 8 | PACKING | FLEXIBLE GRAPHITE | |
| 9 | BOLTS | ASTM A193 B8 | |
| 10 | NUTS | ASTM 194 8 | |
| 11 | PIN | ASTM A276 304 | |
| 12 | EYEBOLTS | ASTM A193 B8 | |
| 13 | NUTS | ASTM A194 8 | |
| 14 | GLAND | ASTM A182 F304 | |
| 15 | GLAND FLANGE | ASTM A351 CF8 | |
| 16 | YOKE | ASTM A351 CF8 | |
| 17 | BEARING | BEARING ALLOY | |
| 18 | NOZZLE | COPPER ALLOY | |
| 19 | STEM NUT | COPPER ALLOY | |
| 20 | BEARING COVER | C.S. | |
| 21 | GRUP SCREW | C.S. | |
| 22 | LOCK NUT | C.S. | |
| 23 | HANDWHEEL | KT33-8 | |
| 24 | NAME PLATE | SS304 | |
| 25 | RIVET | COPPER |
When unpacking, care should be exercised in lifting and handling to avoid damage to valves or injury to personnel. Do not lift any valve by the handwheel or stem. Use lifting lugs or straps around the valve body.
When installing, ensure that all foreign material is removed from the interior of the valve, including desiccants.
NOTE: Do not remove protective end coverings until immediately prior to valve installation.
NOTE: Do not disassemble or modify a Vatac valve in any way prior to installation. This will void the factory warranty if it occurs.
When installing flanged or ring joint end flex wedge gate or globe valves into the line, it is advisable to have the valve slightly open to prevent the wedge from becoming “stuck” due to thermal expansion and to discourage damage to the seating surfaces.
There is an exception to this with Butt-weld end valves, they should be installed in a lightly closed position.
|
PROBLEM |
PROBABLE CAUSE |
SOLUTION |
|
Leakage through the stem packing |
a. Gland nuts are loose b. Gland is binding against the stem or packing chamber wall c. Inadequate amount of packing rings d. Packing is hard and dry e. Packing was not properly cut and staggered f. Stem is damaged |
a. Tighten gland bolts. b. Check to insure gland is centered and evenly tightened c. Install additional packing rings d. Replace with new packing e. Replace with new packing f. Repair or replace as required. |
|
Problems in operating valve |
g. Stem binding during travel h. Stem packing is exerting excessive force on the stem i. Stem is damaged j. Internal components may be damaged |
g. Remove dirt and lubricate stem with grease h. Check torque on gland nuts. i. Examine stem through full open and close action. Repair or replace as required j. Disassemble the valve. Inspect and repair as needed |
|
Bonnet Leakage |
k. Bonnet nuts are loose l. Gasket is damaged m. Flange faces are damaged |
k. Tighten to values listed in Table A. l. Disassemble and install a new gasket. m. Repair and install a new gasket. |
|
Seat Leakage |
n. Valve not properly seated o. Internal components are damaged or worn |
n. Check to see if valve is tightly closed o. Inspect internal components and repair as required |
