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High Performance Butterfly Valve
Sizes 2(50A) 36 Inch(900A)
ANSI Class 150 and 300
JIS 10K and 20K

 

Features and Benefits

● Integrally cast mounting pad procides direct mounting of Keystone actuators
● Rocker-shaped gland bridge compensates for uneven adjustment of gland nuts.
● Extended neck allows for two inches of pipeline insulation.
● Flattende body bore at stem journal ports positions stem bearings near disc, providing maximun stem support.
● Disc taper pins are tangentially positioned half in disc and falf in stem, placing them in compression rather than shear, which eliminates potential for failure.
● Integrally cast disc position stop perfectly locates the disc in seat, achieving maximun seat and seal life.
● Uninterrupted flange face retaining ring allows use of standard spiral wund gaskets and provides unidirectional dead-end service as standard. Bi-directoinal dead-end service is available.
● K-Lok polymer, elastomer, and fire-safe seats provide bi-directional, drop-tight closure in vacuum and throughout all pressure ranges, as well as at full rated differential pressure. A variety of materials allows optimum seat life in all applications.

 
Recommended Standard and Specifications
 
ANSI- B16.34
B31.1
B16.5
B31.3
Steel valves
Power piping
Steel pipe flanges and flange fittings
Chemical Plant and petroleum refinery piping
MSS- SP-6
SP-25
SP-55
SP-61
SP-67
SP-68
Standard finishes for pipe flanges
Standard marking systems for valves
Quality standard for steel casting
Pressure testing of steel valve
Butterfly valves
High pressure offset seat butterfly valves
API- 609
607
598
Butterfly valves
Fire test soft seated quarter-turn valves
Valve inspection and test
BS- 5146

4504
Inspection and test steel valves for the petroieum, petrochemical and allied industries
Flanges and bolting for pipes, valves and fittings
DIN- 3230 Technical conditions of delivery for valves
ISO- 5752
2084
Metal valves for use in flanged pipe systems
Pipeline flanges for general use
JIS- 2220 Steel welding pipe flanges
 
 
Materials
 
No Part Material Material Standards
1 Stem 17-4PH SS ASTM A564 H1075 or H1100
2 Body Carbon Steel
Stainless Steel
ASTM A216 WCB
3 Gland Bridge 17-4PH SS ASTM A351 CF8M or CF8
4 Packing Gland 316 Stainless Steel  
5 Stem Packing RTEF
Graphite
 
6 Stem Bearing RTEF fiberglass epoxy
316SS Nitrite
 
7 Body Gasket Non-asbestos
Graphite
 
8 Disc Stainless Steel
Al-Bronze
ASTMA351 CF8M or CF8
ASTM B148-952
9 Seat Polymer
Elastomer
Metal
Fire-safe
PTFE or RTFE
Viton, Buna-N(NBR), EPDM
316 Stainless Steel
RTFE/316 Stainless Steel
10 Seat Backing Ring Polyester or Phenolics
Stainless Steel
 
11 Seat Retainer Ring Carbon Steel
Stainless Steel
ASTM A36
ASTM A351 CF8M/A276-316
12 Flange Locator Plate Carbon Steel zinc plate
Stainless Steel
 
13 Disc Locator 316SS  
14 Bottom Cover Gasket Non-Asbestos
Graphite
 
15 Bottom Cover Plate 316SS ASTM A351 CF8M/A276-316
16 Thrust Washer Stainless Steel/RTFE
Stainless Steel Nitrite
 
 
   
 
Principles of Operation

Double Offset Disc/Stem
K-LOK's unique two-piece stem and double-offset disc/stem design allows for high cycling and creates a lower disc profile with increased capacity and a rangeability of 33:1

In addition to increasing the flow area across the disc, this design minimizes wear points between seat and disc.

The first offset is achieved by locating the stems downstream of the center-line of the seat. This allows for a totally unobstructed 360° sealing surface.

The second offset locates the stems off-center of the vertical axis of the seat.

The combination of these two offsets creates a camming effect as the disc swings into and out of the seat. The disc swings into and out of the seat. The disc lifts quickly out of the seat in the first few degrees of travel and does not contact the seat again until it is nearly closed.
There are no wear points betwoon the seat and disc, while operating torques are reduced and seat life is extended.

Two-piece Stem vs. One-piece Stem
K-LOK's disc geometry maximizes flow capacity by increasing the available flow area through the valve. This increase in disc effciency results in a higher valve Cv.
 
 
Fire Safe Valve

API607 4th Edition Approved by Third Parth Witness
The K-LOK fire-safe design uses a stainless steel or MONEL allry seat of convoluted shape that mates with an RTFE member, Inthe full-closed position, the K-LOK provides continuous tow-plane contact between the disc and both metal and RTFE seats. The fire-safe seat utilizes wire windings to provide the circumferential stiffness necessary to maintain interference between disc and seat.
 
Fire-Safe Seat
 
Fire-Safe Packing
K-LOK fire-safe packing is composed of three ring of preformed graphite between one ring of woven graphite rope at the top and bottom

This arrangement creates a superior, high temperature seal against the outer wall of the packing box and around the rotating stem.

Fire-Safe Packing
 
 
 
Seat Design
 
The K-LOK seat is a true interference seat design and dose not rely on line pressure to assist in sealing. All seats seal drop-tight bi-directionally at low pressure as well as high pressure.

Polymer(PTFE, RTFE and UHMWPE) seats incrporate a stainless steel braided wire winding, enclosed in a U-shape envelope to provide seating energy and memory. This wire winding allows axial flexibility in both directions of flow. The winding also allows radial flexibility when the disc is not fully closed, reducing seat/disc interference, seat wear and stem torque. When the disc closes, it provides circumferential stiffness and assures the required disc/seat seals tight.

Elastomer seats are molded around a stack of V-shaped steel rings that provide the same stability, support and flexure as the wire windings in polymer seat.

Metal seats employ a stainless steel or MONEL ring of convoluted shape, reinforced by stinless steel wire windings. The thin, convoluted shape allows for expansion and contraction from thermal cycling. Long life is assured by flash coating the seat with chrome.
 
 
Actuator Figure Remark
Handle F401 Lever lock
Gear F420 & F500  
Pneumatic F79X An extended travel design
Gear & Pneumatic F453 + F79X Declutchable gear unit provides manual override for the Keystone pneumatic atuator.
Electric F777  
 
Common Available Trims

To order a K-LOK, specify the valve size, the specific application trim code. The most common codes, together with the materials of construction, are listed below.
 
 
 
Seating and Un-seating Torque

Seating and un-seating torques are a function of the size of the valve and the shutoff pressure of the system.

Specific torque ratings can be found in the seating/Un-Seating chart at the intersection of the 'size' row and the 'shutoff pressure' column.

Torques listed are for PTFE and RTFE seated valves. For different seat materials specific multipliters are to be used as stated.

All torques listed are for normal/service conditions(I.e.operating frequency is a minimum of once per month:disc corrosion is expected to be mild or minor, the media is a clean gas, liquid or steam, and is non-abrasive) and chemical affects upon the seat are minor.