Válvulas > Acero Carbono > Mariposa High P. > Standars

STANDARS

  TRIPLE OFF-SET BUTTERFLY VALVES  - STANDARD FEATURES

QUALIFIED RANGE
 CLASS RATINGS: Up to class 600
 SIZE: All Sizes

 TEST RESULTS

Test Measure

Allowable leakage rate
( ml/Min./NPS )

Test Result
( ml / Min.. / NPS )

Seat Leakage
(During the burn period)

100

0
Zero leakage

External Leakage
(During the burn and cool down period)

25

0
Zero leakage

Seat Leakage
(After operation)

20

0
Zero leakage

External leakage
(After operation)

25

0
Zero leakage










MANUAL GEAR OPERATION
PK valves adopt a worm gear operation served as a standard of PK.
This type of valve has advantages of large output and easy operation due to high gear ratio, so that it is used extensively for quarter turn valves.
The gear constructed by self-locking mechanism is suitable for triple offset valves whic require torque seating. Clockwise turning of handwheel makes valve closed and counterclockwise turning makes valve opened.


ELECTRIC MOTOR ACTUATOR OPERATION
This valve is operated by an electric signal coming from electric motor to open, close or stop the valve in the process of operation. Position limit switch or torque switch signals stop at full open or close. Electric motor actuator is applied mainly to large size or high pressure valves because of greater torque over pneumatic actuator.
This type has advantages of simple wiring and good response. In addition, a remote control is available, and therefore the valve can be applied to a dangerous or limited space where it is difficult for man to access.
 

PNEUMATIC ACTUATOR OPERATION
This type of valve is operated by a signal of air pressure, which is normally 2-9 kgf/crrl in
control parts. There are two operating methods; single acting and double acting. Single acting actuator is divided into full close and full open according to spring acting orientation. It is useful for control valve by virtue of its characteristics of safety and easy handling.
Besides, the construction is more responsive than electric motor or hydraulic actuator.
Double acting actuator is served as PK standard with air regulator, solenoid valve, and position indicator types. However, PK is able to make whatever customer wants.


 

WAFER AND LUG TYPE

API 609 Table 2./ MSS-SP-68 Table 1
Class 150 & 300 : 3" ~ 24"
Class 600 : 3" ~ 12"

ISO 5752 Table 5
Class 150 & 300 : 28 " ~ 48"
Class 600 : 14 " ~ 24"

DOUBLE FLANGE

ISO 5752 Table 4, BS 5155 Table 6(short) Class 150 & 300 : 3" - 24"
ISO 5752 Table 4, BS 5155 Table 6(long) Class 600 : 3 " - 12 "

ISO 5752 Table 4, BS 5155 Table 6 (short)
Class 150 & 300 : 28 " ~ 80"
ISO 5752 Table 4, BS 5155 Table 6 (long) Class 150 & 300 : 3 ff ~ 80 ff Class 600 : 14 ff ~ 24 ff
ASME B16.10
Class 150 & 300 : 3 " ~ 24"
Class 600 : 3 " ~ 24 "

BUTT WELDING

ISO 5752 Table 4, BS 5155 Table 6 (long) Class 150 & 300 : 3 " ~ 80"
Class 600 : 3 " ~ 24"

END FLANGE

ASME 816.5 : Class 150, 300, 600
JIS 82210 : 10K, 16K, 20K, 30K, 40K
DIN, ISO PN10, PN16, PN20, PN25, PN40

ASME B16.47 series A: Class 150, 300 MSS-SP-44 : Class 150, 300, 600 BS 3293 : Class 150, 300

MOUNTING FLANGE

ISO 5211

TESTING
API 598
MSS-SP-61, ANSI 816.104

 

TRIPLE OFFSET DESIGN PRINCIPLES
 PK triple offset metal seat butterfly valves provide a bi-directional and bubble-tight shutoff which is attributed  to the geometry of triple offset seat. 
The valve stem is offset by seat (1 st offset) and the valve seat surface center line is offset against the center line of pipe (2nd offset) and the conical axis is offset by valve center line (3rd offset: inclined cone). The 3rd offset completely eliminates rubbing.
The seat surfaces of body and seal ring in triple offset valve contact with the inclined "cone-in-cone" and this design requires excellent sealing and seat part durability by slight wedging effect.
In addition, the angle of contact between body and seal ring has a good sealing performance by low torque because the angle travels the initial torque from actuator to seat parts without any loss by jamming.
This valve is characteristic of concentric, offset and double offset construction with remarkable sealing performance and seat part durability, and moreover it is hardly needed to repair.

  CHARACTERISTICS AND MERITS

  • Excellent durability of seat part and low operating torque by non-rubbing characteristics with triple offset construction.
  • Bi-directional zero leakage service by resilient metal sealing and torque seating.
  • Unrestricted selection of face to face dimensions for API, ASME(ANSI), BS, ISO, etc. and perfect interchangeability of gate, ball, plug, high performance butterfly, and other valves.
  • Low emission by quarter turn construction and good performance at automation by virtue of low operating torque and low cost.

 BODY

  • The valve body shall be one piece cast or fabrication.
  • The body can be supplied with different types of materials in wafer, lug, or flanged and butt welding end connections to satisfy all installation requirements.

 BODY SEAT

  • The valve seat shall be integrated with the body.
  • Stellite or stainless steel shall be applied on the seating surface of valve body.
  • The valve seat is designed for inclined cone to ensure non-rubbing, non-jamming, bi-directional shutoff, and zero leakage.

 DISC

  • The valve disc shall be the same material as the valve body. It is supported by laminated seal ring, which is kept in place by seat retainer ring bolted to the disc and can be replaced easily.
  • The spiral wound gasket shall be provided between laminated seal ring and disc.

 SEAL RING (LAMINATED)

  • The seal ring shall be resilient stainless steel lamella alternated by graphite, aramid fiber & cermic fiber layers.
  • The surface contacting between seal ring and body seat is an inclined cone type and the inclined angle generates a slight wedging effect.
  • With a seat retainer ring bolted to the disc, the seal ring is fixed to disc not too tightly to be replaced easily.

 STEM

  • The stem shall be stainless steel and one piece & two piece construction.
  • The stem shall be fixed to the disc by pin or in combination of pin and key. It can be protected by internal thrust bush and bush bearing.
  • The thrust bush and bush bearing shall be provided to locate the valve disc in a proper position.
  • The retainer ring shall be installed to avoid blowing out the stem.

 PACKING

  • The packing shall be consist of two braided rings in the top and bottom of valve and three die formed graphite rings in the middle.
  • The lantern ring may be provided as required by customer.

 ACTUATORS

  • All valves shall be self-locking manual gear operation type which is served as standard. . Electric, pneumatic or hydraulic actuator may be provided as required by customer.




 

 

 
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