INTRODUCTION
Our STAINLESS STEEL VALVES are utilized in the chemical, petrochemical, food,
paper, and pharmaceutical processing industries allover the world.
Our STAINLESS STEEL VALVES are designed and
manufactured in conformity with API, ANSI, BS and other standards recognized
with quality meeting the stringent requirements for such industrial
applications.
Our STAINLESS STEEL VALVES are specialized
products through the processes of design, material selection, manufacturing,
quality control, and experiences to final product.
SHELL WALL THICKNESS
|
WALL THICKNESS |
CLASS |
BOLTED BONNET TYPE |
PRESSURE SEAL BONNET TYPE |
ASME B16.34
API 603
(LIGHT WALL) |
150 |
1/2" - 24" |
- |
|
300 |
1/2" - 24" |
- |
|
600 |
2" - 12" |
2" - 24" |
|
900 |
- |
2" - 24" |
|
1500 |
- |
2" - 24" |
|
2500 |
- |
2" - 18" |
API 600
(HEAVY WALL) |
150 |
2" - 60" |
- |
|
300 |
2" - 44" |
- |
|
600 |
2" - 24" |
2" - 24" |
|
900 |
2" - 24" |
2" - 24" |
|
1500 |
2" - 12" |
2" - 24" |
|
2500 |
- |
2" - 18" |
|
|
|
|
|
[VALVE
DIMENSIONS] | [STANDARD
MATERIALS] |
[DESIGN
FEATURES]
INVESTMENT CASTING
Investment casting of PK valve shall be manufactured up to 1" for class 150 and
300.
VALVE SHELL MATERIALS
PK valve shell materials shall be in accordance with ASTM A351 Grade CF8M & CF8
and the others are optional.
|
ASTM
Designation |
maximum working temperature
°F (°C) |
|
A351 Gr. CF8 |
1500 °F (816°C)* |
|
A351 Gr. CF8M |
1500 °F (816°C)* |
|
A351 Gr. CF3 |
800 °F (427°C) |
|
A351 Gr. CF3M |
850 °F (454°C) |
|
A351 Gr. CF8C |
1500 °F (816°C)* |
|
A351 Gr. CN7M |
300 °F (149°C) |
|
A890 Gr 4A (UNS J92205) |
600 °F (316°C) |
|
A890 Gr 6A (UNS J93380) |
600 °F (316°C) |
| *
At temperatures over 1000°F, use the material only when the carbon contents
is 0.04% or higher. |
|
|
|
|
[VALVE
DIMENSIONS] | [STANDARD
MATERIALS] |
[DESIGN
FEATURES] OPTIONAL
BONNET FLANGE GASKET MATERIAL
Depending on service conditions,
various materials are available optionally for flange gasket and stem
packing. |
| A. Gasket
materials |
B. Packing
materials |
| 1. Glass
fiber sheet |
1. PTFE
|
| 2. Spiral
wound material (Graphite or PTFE ) |
2. Graphite |
| 3. PTFE
|
3. Glass
fiber sheet |
| 4. Metal
ring |
|
| 5. Graphite
|
|
DESIGN FEATURES OF PK STAINLESS STEEL GATE VALVE
WEDGES
PK adopts an H-shaped flexible solid wedge of which the size is 3" and larger
for Class 150 and 2" and
higher for Class 300/600. The H-shaped flexible solid wedges are featured with
mechanical flexibility to be able to adjust to the shape of body seat for secure
mutual contacts.
It has a particular importance when large gate valve is applied to extremely
high pressure and temperature that temporary deformation may occur in valve all
the time.
If the H-shaped wedge is provided, operating torque would get smaller, seat wear
less, and valve closing tighter.
|
|
|
| |
PLAIN SOLID WEDGE |
FLEXIBLE SOLID WEDGE |
|
CLASS
|
|
 |
|
150 |
2 1/2" & SMALLER |
3" & LARGER |
|
300 |
1" & SMALLER |
1 1/2" & LARGER |
|
600 |
- |
2" & LARGER |
|
