Payment & Shipping Terms:
|Size：:||NPS 2"~56"||Pressure Rating：:||Class 150~2500|
|Material：:||WCB, LCB, WC6, WC9, C12,CF8, CF8M, CF3,CF3M,etc||Temperature：:||-196°~593°|
|Design & Manufacturing Standard：:||API 600, BS 1414, ASME B16.34||Face To Face：:||ASME B16.10, API 6D, BSEN 558|
|End Connection：:||ASME B16.5, ASNE B16.47, BSEN 1092||Operation Method：:||Manual ,Worm Gear, Electric Actuator, Pneumatic Actuator|
API 600 cast gate valve, flexible wedge, OS&Y, bolt bonnet
APPLICATION & FUNCTION
Gate valves are primarily used for stop valves fully opened or fully closed. They are not normally considered for throttling purposes, but more for slurries, viscous fluids, etc. Gate valves are characterized by a traveling wedge, which is moved with the operation of the stem nut. The wedge travels perpendicular to the direction of the flow. Gate valves usually have a minimum pressure drop when fully open, provide tight shut-off when fully closed, and remain relatively free of contamination buildup.
BODY & BONNET
The design of the body and bonnet is calculated to achieve the most regular distribution of stress in all directions, as well as the minimum turbulence and resistance to flow. Valve bonnets are equipped with a backseat bushing. The yoke is integrally cast on Pressure Classes 150 and 300 up to 12” and up to 10” on Class 600 and higher ratings.
All gates are fully guided to the seats. As standard our valves are supplied with a solid flexible gate that has a tapered H cross-section. The flexible wedge is cast or machined with a circumferential groove to allow the seating surfaces to move independently and adjust to movement of the body seats. This design is beneficial where line loads or thermal expansion of the system is likely to distort the seat face in the valve. This design of gate is ideally suited for steam or other high temperature services and is especially useful to prevent sticking where valves are closed when hot and opened when cold.
Seat rings are designed to greatly reduce and/or prevent any turbulence and avoid damages due to the corrosion. The seat rings are forged or rolled in one piece, and then seal welded and overlaid, if required. After welding and all required heat treating, the seat ring faces are machined, thoroughly cleaned and inspected before leaving for assembly.
The stem connection to the gate is a T-head design which is integral (without welding) with the stem. The accuracy in the dimensions and finishes assure a long life with a perfect tightness in the packing area, resulting in lower fugitive emissions. The stem-to-gate connection is designed to
prevent the turning or the disengagement of stem from the wedge while the valve is in service. Through calculations and extreme testing, the strength of the stem-to-gate connection has proven to exceed the strength of the stem at the root of its operating thread.
The stem packing is designed and arranged to ensure a maximum seal along the stem during operation or while at position,
thus allowing for a greater reduction in fugitive emissions. Our packings are NONASBESTOS types.
Kelite Valve can supply any style of packing required by our customer.
The depth of the stuffing box allows for a sufficient amount of packing, which makes the stem seal. Our standard packing arrangement and stuffing box design meets <100 ppm fugitive emission requirements. If specified in the purchase order, lantern rings and/or grease injectors can be furnished.
The packing gland design is a two-piece self-aligning type. The packing gland has a spherical head that rides within the spherical joint of the gland flange. The packing gland has a shoulder, which restricts the complete entry into the stuffing box bore. This particular design assures a straight compression of the packing as the gland eyebolts are being equally adjusted, without injuring the stem.
The stem nut arrangement and design allows for the removal of the handwheel without allowing the stem and gate to drop into the closed position if the handwheel is removed while the valve is in the open position. Ball bearings are provided in the stem nut arrangement of Class 150 valves from NPS 14”, on Class 300 valves from NPS 12:, on Class 600 valves from NPS 6”, and on Classes 900-1500 valves from NPS 2”.
Handwheels are designed for easy operation and a comfortable grip. Our valves are also available with gearing, motor actuators or cylinder actuators for the more demanding services.
BOLTS AND NUTS
For normal service conditions, ASTM A194 Class 2H and ASTM A193 Grade B7 nuts and stud bolts are furnished. If specified for high temperature service conditions, ASTM A194 Class 4 and ASTM A193 Grade B16 nuts and stud bolts are furnished. Standard bolting furnished for our stainless steel valves consists of ASTM A194 Class 8 and ASTM A193 Grade B8 nuts and stud bolts.
Kelite Valve can supply any bolting as required by the customer.
Our standard production covers valves with:
Accessories such as gear operators, actuators, bypasses, locking devices, chainwheels, extended stems and bonnets for cryogenic service and many others are available to meet the customers requirements.
TECHNICAL PARAMETERS AND CHARACTERISTICS:
|Product description||Wedge resilient gate valve|
|Nominal diameter||NPS 2”～56”|
|Operating temperature||-196℃～593℃(the range of service temperature may vary for different materials)|
|Operating pressure||150-2500 CLASS|
|Material||A216 WCB,WCC; A217 WC6,WC9,C5,C12,C12A,CA15; A351 CF8,CF8M,CF3,CF3M,CF8C,CN3MN,CK3MCUN,CN7M; A352 LCB,LCC; A494 CW-6MC,CU5MCuC,M35-1; A890 4A(CD3MN),5A(CE3MN),6A(CD3MWCuN); ASME B 148 C95800,C95500, etc.|
|Design standard||API 600,ASME B16.34,GB 12234,GB 12224|
|Structural length||ASME B16.10|
|Connecting end||ASME B16.5,ASME B16.25,GB 9113,GB 12224|
|Test standard||API 598,ISO 5208,JB/T9092,GB/T13927|
|Operation method||non-elevating hand wheel, bevel gear, motor drive unit, pneumatic drive unit|
|Application fields||For application in fields such as electric power industry, petroleum refining, petrochemical engineering, offshore oil, tap water engineering in urban construction, chemical engineering, etc.|
|Other remarks 1||The sealing faces of valve seat and valve clack are build-up welded with hard alloy to improve the erosion resistance and extend the service life of valve.|
|Other remarks 2||SS+ graphite or metallic seal or pressure self-sealing is adopted between valve body and bonnet for reliable sealing|
|Other remarks 3||Rising stem structure, making the valve switch position be clear at a glance|
|Other remarks 4||The valve stem thread will not come into contact with the medium, so the corrosion of medium to the thread is reduced.|
|Other remarks 5||Small switching moment, reliable sealing|
|Other remarks 6||The gate valve is of wedge and resilient type that can compensate the slight deformation, so the sealing performance is good.|
|Other remarks 7||Small flow resistance, high flow capacity and good flow characteristics|
|Other remarks 8||For small gate valves, the interchangeability can be ensured with process tooling.|
|Other remarks 9||Through improving the structural design and selecting reasonable packing structure and qualified packing supplier, the valves can meet the Class A sealing test requirements of ISO 15848 FE.|