Fully welded ball valve with soft or metal seat 1/2"-56",
Kelite Valves is famous for manufacturing fully welded ball valves
in China market, we have made 56”CL600 fully welded ball valves for
Iran market, a special technique was performed so that post welding
heat treatment is not required so soft seals will not to be damaged
during the welding process to make sure the seals good performance.
One-piece body, full bore/reduced bore, trunnion mounted, double
block and bleed, single or double piston effect, anti-blow out
stem, anti-static device, fire-safe certified to API-607/6FA/ISO
10497, spring loaded Seats, sealant injection, NACE MR-01-75,
NYLON, DEVLON&PEEK seat inserts, designed and tested according
to ASME B16.34, BS5351,KS and API-6D.
Kelite fully welded ball valve, widely used in urban underground
gas pipelines,natural gas pipelines and pressure regulating
stations and other fields.In the past years,through continuous
research and innovation and improvement of product quality.
Kelite fully welded ball valve,due to the overall structure of the
valve fully welded construction using technology to make the valve,
the outer seal has been greatly improved, the valve's weight has
been greatly reduced (especially DN300 or less) so that the valve
installation becomes more convenient, not only reduces the cost of
construction, but also saves time.
Kelite fully welded ball valve,can be directly buried underground.
Do not set the underground valve control room, so that operations
do not need to go into the ground, just drive operation can be
carried out on the ground with a T-handle,very easy to avoid the
past due to the underground valve control room set up and there
Kelite fully welded ball valve,the valve can be designed in
different height for your users based on the depth of buried gas
pipeline.Meanwhile,also according to the different needs of users
connected to the valve port,you design a variety of port
connections for you to choose from.
Structural characteristics and advantages for Full weled ball valve:
1. Anti-leaking stem
In order to prevent the stem fly cause abnormal elevation of
internal pressure valves, dry shoulder fixed lower portion.
Further, in order to prevent leakage resulting from burnout stem
packing in a fire, the thrust bearing in the lower portion of the
contact position in the stem and body shoulders therefore prevent
the formation of anti-sealing seat leakage to avoid accidents.
2. Fire safety structure
When the trunnion ball valves normal use, the seat and the
spherical stamp law, seat retainer o-ring and seal body, which is a
soft seal, reliable seal and o-ring seat when injured, seat holder
and the body will be stamped expanded graphite such behavior fire
3. Anti-static equipment
In order to prevent friction among ball, stem and PTFE static
electricity may ignite flammable materials and explosives,
resulting in an accident, in this ball valve, static-conduction
spring between the stem and the ball, the stem and the body and
therefore static ground system security to be secured.
4. Free body leaking seal structure
Smooth, double stamped gaskets and o-rings, on this basis, for this
reason as fire switch position of the valve and the valve bonnet,
high temperature, shock and uneven opening or closing torque will
not cause external leakage.
5. Low operating torque
Self-lubricating bearings installed in the friction of stem cells,
leading to wear and flexible operation and low torque.
6. double block bleed (DBB)
When the ball fully open or closed position, the transmitter
substance the body can drain cavity Center announced, emptying
devices Moreover, it is the center of the valve chamber pressure
can be released into the low pressure end of his rescue seats.
7. Emergency sealing
Composite injection hole design and install complex injection valve
located in the stem / hat and physical support when the valve stem
seal or seat damage induced leakage, such compounds can be used to
make a second check valve seal hidden installed near both composite
injection valve, to prevent the outflow of action of the compound
material, a composite of the top of the transmitter composite fuel
injection valve of fast connection connector injection gun.
8. Stem extension
Underground installation valve stem can be extended to facilitate
the operation corresponding composite nozzle, the drain valve can
be extended to the highest valve.
9. Automatic body cavity relief
When the body pressure rise is not normal, such as instability,
trunnion ball valve downstream seat will be normal pressure, while
not normal automatic release of pressure, do not damage the sealing
of upstream seat.
• Standard Temperature: -29°C to 220°C / -20°F to 428°F
• Low Temperature: -46°C to 150°C / -50°F to 302°F
• Cryogenic Temperature: -196°C to -593°C / -258°F to -620°F
• Subsea (Shallow & Deep Water)
• High Temperature: Above 220°C / 428°F
Kelite fully welding ball valves design characteristic:
- Kelite Side Entry ball valves are used in pipelines, pumping and
compression stations, offshore, onshore, subsea and cryogenic as
well as abrasive and high temp applications.
- The extensive size range and pressure class are available in a
variety of materials including Carbon, Alloy & Stainless steel
suitable for general to severe service conditions.
- The Kelite fully welding ball valves are available with Double
Block & Bleed independent of the seat type.
- Single piston effect (SPE) is the standard feature for the seat
rings of the KELITE fully welding ball valves.
On a SPE seat ring: The pressure acting on the upstream side of the
seat ring generates a force which push the seat towards the
ball.The pressure acting on the downstream side of the seat ring
generates a force which pull the seat ring away from the ball.
Any overpressure which may be generated by the thermal expansion of
the fluid trapped in the body cavity with the ball in fully closed
position, will be automatically discharged in the line on the lower
- Double piston effect (DPE) is a standard feature for the seat rings
of the KELITE fully welding ball valves & recommended for
welded body valves. On a DPE seat ring, both the pressure acting on
the upstream side of the seat ring and the pressure acting on the
down stream side of the seat ring, generate a force which push the
seat towards the ball. With this type of seat ring, the eventual
overpressure which may be generated by the thermal expansion of the
fluid trapped in the body cavity with the ball in fully closed
position, can be discharged by the use of an external safety relief
device. The Double Piston Effect grants a double sealing feature,
if the upstream seat ring is damaged, the down stream seat grant
the sealing feature of the valve.
Technical parameters and characteristics:
|Product description||Fully welding ball valve|
|Model||Fully welding trunion forging ball valve|
|Nominal diameter||NPS 2”～NPS 56”|
|Operating temperature||-593℃～220℃(the range of service temperature may vary for different
|Material||A105N, A182 F304, F304L, F316, F316L, A352 LF2, LF2, etc.|
|Design standard||API 6D,ASME B16.34|
|Structural length||ASME B16.10|
|Connecting end/td>||ASME B16.5,ASME B16.25|
|Test standard||API 598, API 6D, ISO 5208|
|Operation method||Handle, worm, motor-drive unit, pneumatic drive unit|
|Application fields||Oil and natural gas pipelines, and urban gas pipeline|
|Other remarks 1||The valve seat is embedded with flexible seal ring for zero leakage
of seal; the valve seat is provided with a preloaded spring that is
adaptive to the variation of pressure and temperature, so leakage
is not liable to happen.|
|Other remarks 2||Integral valve with welded valve body, free of external leakage,
|Other remarks 3||Fire resisting construction of all-welded ball valve. Each leakage
position is designed with flexible graphite packing or stainless
steel mixing graphite to satisfy the fire resisting requirements in
case of a fire.|
|Other remarks 4||The most advanced support plate structure both at home and abroad
is adopted for large diameters to increase the service life and
reduce the operating torque of valve. Thus, the service life of
valves is greatly extended.|
|Other remarks 5||The directly-buried all-welded ball valve can be buried directly,
in which case, no high and large valve pit is required, only a
small shallow pit needs to be built on ground, so the construction
cost and the engineering time can be significantly saved.|
|Other remarks 6||Full bore of valve convenient for pigging, of small flow resistance
and high flow capacity and good flow characteristics|
|Other remarks 7||The valve ball can completely enclose the valve seat when the
all-welded ball valve is opened, so the impurities in the medium
will not be flushed to the valve seat or the packing surface of
valve body. Hence, the valve body has a same service life as the
pipeline due to his special construction.|