- SWING CHECK
- DUAL CHECK
- TILTING CHECK
- PARALLEL SLIDE
- STAINLESS STEEL
- BELLOWS SEAL
- THROUGH CONDUIT
- NON RETURN
■ STANDARD SINGLE PISTON EFFECT (SELF-RELIEVING SEATS) Fluid pressure, both upstream and downstream, creates a resultant thrust that...
■ GENERAL KJS floating ball valves are designed in accordance with API 608 or ISO17292(BS5351) for ANSI Class rating 150 to 2500, Nominal size from 1/2” to 12”. Valves have been designed for use w...
Ball의 상하를 고정점으로 하여 Trunnion과 Bearing에 의해 지지되며 고압과 대형사이즈에 적용된다. Upstream 쪽의 Seat가 Ball쪽으로 말려 Sealing되는 구조이다.
SINGLE PISTON EFFECT (SELF-RELIEVING SEATS) Fluid pressure, both upstream and downstream, creates a resultant thrust that pushes the seat rings against the ball. Fluid pressure acting in the body cavity creates a resultant thrust that pushes the seat rings away from the ball. The single piston design permits the automatic release of any overpressure in the body cavity when the valve is in the fully open or fully closed position, therefore the seat rings are “self-relieving”
DOUBLE PISTON EFFECT Fluid pressure, both upstream and down-stream, as well as in the body cavity creates a resultant thrust that pushes the seat rings towards the ball. Valves with double piston effect seat rings require a relief valve in order to reduce the build-up of overpressure in the body cavity.
■ SEAT SEALING
Soft seats are standard. Seat inserts of synthetic material such as Nylon, PTFE, RTFE or Peek are contained within a one-piece metal seat ring. With no or very low line pressure. sealing between the seats and ball is achieved by seat springs. With higher line pressure, the line pressure, in conjunction with the spring load, forces the upstream seat ring against the ball, which results in tighter sealing.
■ SELF RELIEVING SEAT
This standard feature is designed to prevent excessive pressure buildup within the valve by automatically relieving pressure when body cavity pressure exceeds the spring load on the seats. Double Piston Seat is also available as an option.
■ SEAT RING SEALING
Two o-rings or one each of an o-ring and graphite ring are used for pressure classes 150 through 600. One lip seal with an o-ring or graphite ring is used for the pressure class 900 up to 2500.
■ SEALANT INJECTION FITTING
This feature is standard except in sizes 2”-4” for pressure classes 150, 300 and 600. In case of seat ring damage, sealant injection provides a fast, reliable way to restore tight sealing. This injection system can also be used for routine flushing or the seat ring area while in service.
90도 개폐로 조작시간이 매우 짧고 설치공간이 Gate 나 Globe밸브에 비해 적어도 된다.Ball이 Seatring에 의해 지지되는 구조로 저압이나 소형사이즈에 적용된다.Upstream 압력에 의해 Downstream 쪽으로 Ball이 밀려 Sealing 되는 구조이다.
KJS floating ball valves are designed in accordance with API 608 or ISO17292(BS5351) for ANSI Class rating 150 to 2500, Nominal size from 1/2” to 12”. Valves have been designed for use with various combinations of materials such as; Carbon Steel, Low Carbon steel, special alloy, stainless steel, monel, inconel.
■ BODY JOINT CONSTRUCTION
The one piece unibody end entry design, graphite ring or-oring viton (on request) seals ensure absolute seal integrity. The two piece bolted body designs include a tight toleranced overlapping metal fit between the body and the adapter to minimize any possibility of movement due to pipeline stress. A special high temperature spiral wound stainless steel/grafoil filled gasket is utilized for absolute seal. This gasket is encapsulated by body and adapted on all four sides. Body and adaptors are dimensioned for metal contact to ensure correct gasket crush.
■ BLOW-OUT PROOF STEM
Stem is made separately from the ball, anti blow-up design with suitable PTFE and graphite rings and antistaitc device. The lower and of the stem is designed with an integral collar to be blowout-proof. lt also functions as the backseat for assured stem sealing. (fig. A)
■ ANTI-STATIC DEVICE
All Flow Control floating flange ball valves include dual grounding systems from stem to ball and stem to body. Valve testing to ISO17292(BS5351) was perfomed for all sizes, and witnessed by a third party inspection company. An antistatic feature is provided to ensure electrical continuity for assured stem sealing. (fig. B)
■ LIVE LOADED GLAND FLANGE
Live loading is designed to provide gland load retention, compensating for expected in-service consolidation of the packing. A Set of Belleville-Spring Washers are used on each gland stud to helpexert a continuous compressive force on the gland follower flange and therefore reduce fugitive emissions from the stem packing. KJS standard Belleville-Spring Washers are protected by a weatherproof cap to keep them free from environmental contamination, resulting in a long stable life. (fig. C)
■ LOCKING DEVICE
Stem head design provides mounting of the lever handle always in parallel to the flow passage. Facility for mounting a locking device for prevention of accidental valve operation is provided. (fig. D)
■ FIRE SAFETY
All-fire-safe valves conform to API 607 and API 6FA standards. When fire accident occurs at valve operating jobsite, and components such as seat ring, stem back seat, stem packing and mid-flange gasket which made of non-metallic material such as PTFE were broken or destroyed. However, KJS particularly metal to metal added seal seated designed ball valves can effectively control external or internal leakage. KJS soft seated fire safety designed as follows:
■ LONGEVITY OF LIFE
Special consideration was devoted to the attainment of enhanced life and operation of our valve throughout design, development, testing and manufacturing stages. Valve designs combined with the selection of advanced materials are such that long periods of inactivity should not affect the operations of efficiency.