Cast Steel Floating Ball Valve Class 150-600 Fire-Safe API 607 Flanged
Floating ball valves offer quick quarter-turn operation, visual indication of the valve position, straight uninterrupted flow and compact size. The floating ball is sustained by two valve seats, one on the upstream and the other on the downstream side of the valve. The upstream pressure pushes the ball to the downstream seat ring, compressing the seat to shut off the fluid, guaranteeing bubble-tight sealing. The full bore design minimizes pressure drop across valve while maximizing flow capability for general line services.
Floating ball valve is mainly used in water, oils, natural gas, chemical solvents, acids, etc. with tight shutoff and no maintenance. Due to the low pressure ratings and small sizes, the torque to open or close the valve is small hence mainly manual operation is applied.
Design Features:
1. Special Seat Design
The floating ball valve are normally designed with a flexible seat. When the medium pressure is low, the contact area between the seat and ball is smaller, which forms a higher pressure at the contact area to ensure reliable sealing. When the medium pressure gets higher, the contact area of the seat and ball becomes bigger along with the elastic deformation of the seat, so that the seat could endure higher medium thrust without being damaged.
2. Fire-safe Design
In case the fire accidently occurs in the pipe and valve, the seat ring made of PTFE or other non-metallic materials could be burned down under high temperature, causing massive leakage to the valve. The fire-safe seat design is a precaution design between the ball and seat. After the valve seat is burned away, the medium pressure would push the ball continuously towards the downstream metal seal to form an auxiliary metal-to-metal sealing, which could effectively reduce valve leakage. In addition, the middle flange sealing gasket is made of metal spiral-wound gasket, which could also ensure sealing under high temperature. The fire-safe design of KOLINK ball valves are approved per API 607.
3. Blowout-proof and Sealing Of Stem
The stem is machined with an integral collar at its bottom end, and it is installed from the valve inner cavity, so that the stem is blocked by the valve neck and would not be blown out by the medium even under the abnormal pressure-rising condition in the valve cavity. In addition, to avoid leakage after the stem packing is burned down in case of fire, the thrust washer between the stem shoulder and body contact would form a positive sealing. The sealing force would increase with the increase of medium pressure, to ensure reliable stem sealing under various pressure, preventing leakage and avoiding accident spreading.
4. The chevron packing.
The chevron packing could effectively adjust the sealing pressure against medium pressure at the gland area, and make the sealing of stem packing more reliable.
5. Anti-static Structure
The ball valve is provided with anti-static devices and could form a static channel between the ball and body through the stem, to discharge the static electricity built up due to friction during the operation of the valve, to through the pipeline, avoiding fire or explosion that may be caused by electric spark and ensuring system safety.
6. Valve Locking Device
The manual ball valve could be locked in position when it is fully-open or fully-closed. The positioning piece with locking hole is designed to avoid valve misoperation, and it could also prevent valve opening or closing accidently caused by pipeline vibration or other unpredictable factors. It is effective especially for inflammable and explosive oil, chemical and medical pipelines or field tubing.
Furthermore, the head of the stem that is installed with the wrench adopts double-D design. When the valve is open, the valve wrench is parallel to the pipeline, and when the valve is fully closed, the wrench is perpendicular to the pipeline, so that the fully open and closed indications of the valve are unmistakable.
Features of Floating Ball Valves:
Floating Ball Type
Split Body, End Entry
2-Piece or 3-piece Body
Full Port with small Flow resistance
Fire Safe to API 607
Antistatic Design
Anti-blowout Stem
Gear Operation or Actuator Available
Optional Spring loaded packing
Optional Metal seated design
Optional Low emission packing according to ISO 15848
Applicable Standards of floating ball valves:
a) Design & Manufacture: API 6D, BS 5351, API 608, ISO 17292, MSS SP-72
b) Fire-safe: API 607, API 6FA
c) Face to Face: API B16.10, API 6D, EN 558, DIN 3202
d) End Connection: ASME B16.5, EN 1092, JIS B2220, ASME B16.25
e) Test and Inspection: API 6D, EN 12266, API 598
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Cast Steel Floating Ball Valve Class 150-600 Fire-Safe API 607 Flanged Images
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