Marine Flange Butterfly Valve - Screw Type / Turbine / Handle / JIS 5K 10K

Shanghai Yunlong Marine Valve primarily produces various specifications of marine butterfly valves, gate valves, globe valves, ball valves, needle valves, control valves, throttle valves, plunger valves, check valves, safety valves, pressure reducing valves, self-closing valves, quick-closing valves, stop-check valves, hose valves, plug valves, mud boxes, sea valves, seawater filters, oil filters, anti-slam valves, air caps, sounding self-closing valves, hydraulic control valves, marine valves,

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Our company produces marine wafer-type signal butterfly valves | fire protection butterfly valves | marine protective signal butterfly valves GB/T3036-94

Material: Stainless steel, cast steel, alloy steel

Nominal pressure: 1.0MP-6.4MPa

Nominal diameter: DN50-DN500

Current and voltage: Compatible with both DC and AC

Applicable medium: Water

Operating temperature: ≤80℃

Application: The top of the signal butterfly valve is equipped with an electric signal device for valve opening and closing. When the valve is mistakenly closed by 25% (one-quarter of the full opening), the electric signal device outputs a signal of mistaken closure to the fire control center. Therefore, this butterfly valve is a **** supporting product for automatic fire sprinkler systems.

Structural features and working principle

The electric signal device of this butterfly valve is designed at the top of the worm and worm gear drive mechanism and is directly connected to the valve stem. Inside the precision fully enclosed electromechanical device, there are mechanical indicators for valve opening, imported electrical components, and anti-corrosion mechanical parts. The output signal is stable and reliable.

Application and characteristics of marine double-eccentric butterfly valve GB/T3037-94:

Product name: Marine double-eccentric butterfly valve GB/T3037-94

Connection method: Flange; wafer-type; lug-type.

Structural type: Centerline type, double-eccentric type

Product type: Type A, B, AS, BS, CS, SX, ES, QS, DS, FSB, FA, FB, FD, FQ

Product diameter: DN40-1200

Product pressure: 5K, 10K, 16K, 0.6, 1.0, 1.6Mpa, 125LB, 150LB, 300LB.

Valve body material: Cast iron, cast steel, stainless steel, bronze.

Valve disc material: Stainless steel, ductile iron, aluminum bronze, cast steel.

Valve seat material: NBR, PTFE, FKM

Product introduction: Manufacturing standards: Chinese GB, Mechanical JB, Chemical HG, American API, ANSI, German DIN, Japanese JIS, JPI, British BS. Valve body materials: Copper, cast iron, cast steel, carbon steel, WCB, WC6, WC9, 20#, 25#, forged steel, A105, F11, F22, stainless steel, 304, 304L, 316, 316L, chrome-molybdenum steel, low-temperature steel, titanium alloy steel, etc. Working pressure: 1.0Mpa-50.0Mpa. Working temperature: -196℃-650℃. Connection methods: Internal thread, external thread, flange, welding, butt welding, socket welding, clamp, coupling. Drive methods: Manual, pneumatic, hydraulic, electric.

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Introduction to lug-type butterfly valves:

1. Valve body material: Gray iron, ductile iron, cast steel, aluminum alloy, stainless steel, etc.

2. Valve disc material: Duplex stainless steel, nylon 11 plate, galvanized plate, aluminum bronze

3. Valve seat: NBR, EPDM, VITON, PTFE, R-PTFE

2. Usage requirements

1. Nominal diameter: DN50-1000 (mm)

2. ****Nominal pressure: 1.6Mpa

3. Applicable temperature: -50℃—235℃

4. Drive type: Pneumatic (limit switch, solenoid valve, handwheel, ****)

3. Product characteristics

1. Extruded high-strength aluminum cylinder body, finely ground inner surface and hard anodized treatment, low friction coefficient, long service life, strong corrosion resistance.

2. Double-piston gear rack design, compact structure, symmetrical installation position, easy to change output shaft direction, long service life, quick action.

3. Combined pre-loaded coated springs, long working life.

4. High-precision gears and racks, small meshing clearance, high precision, high output power.

5. Stainless steel fasteners, safe and aesthetically pleasing, strong corrosion resistance.

6. Elegant, compact, modern design, multiple specifications in the product series, making selection more economical and convenient.

7. Fully compliant with **** standards: Output shaft slots and screw holes; top mounting hole dimensions comply with NAMUR standards; air source interface dimensions comply with NAMUR standards; bottom mounting hole dimensions comply with ISO5211 and DIN3337 standards, facilitating the installation of accessories such as solenoid valves and limit switches.

4. Versatility

Widely used in pipelines of marine, petroleum, chemical, food, papermaking, water and electricity, water supply and drainage, metallurgy, energy systems, suitable for various corrosive gases, liquids, semi-liquids, and solid powder media.

Extended stem butterfly valves, also called flap valves, are simple regulating valves that can also be used for on-off control of low-pressure pipeline media.

Extended stem butterfly valves have a disc-shaped closing element (valve flap or butterfly plate) that rotates around the valve shaft to open or close. They are primarily used for cutting off and throttling in pipelines. The closing element is a disc-shaped butterfly plate that rotates around its own axis inside the valve body to achieve opening, closing, or regulation. The rotation from fully open to fully closed is typically less than 90°. Extended stem butterfly valves and the valve stem itself do not have self-locking capability. To lock the butterfly plate in position, a worm gear reducer is installed on the valve stem. The worm gear reducer not only provides self-locking capability, allowing the butterfly plate to stop at any position, but also improves the valve's operational performance. Industrial butterfly valves are characterized by their ability to withstand high temperatures and higher pressure ranges. The valve body is made of carbon steel, and the valve disc's sealing ring is replaced by a metal ring instead of a rubber ring. Large high-temperature butterfly valves are manufactured by steel plate welding and are mainly used in high-temperature media such as flue gas ducts and gas pipelines. Under normal conditions, the service life of the sealing seat is 15-20 years for rubber and 80-90 years for metal. The operating torque of extended stem butterfly valves varies with the degree of opening and the direction of valve operation. For horizontal butterfly valves, especially large-diameter valves, the torque generated by the water head difference at the upper and lower parts of the valve shaft cannot be ignored.

Additionally, when a elbow is installed on the inlet side of the valve, it creates biased flow, increasing the torque. When the valve is at an intermediate opening, the hydrodynamic torque comes into play, requiring the operating mechanism to be self-locking. Butterfly valves feature simple structure, small size, light weight, low material consumption, small installation dimensions, quick switching, 90° reciprocating rotation, and low driving torque. They are used to cut off, connect, and regulate media in pipelines, offering good fluid control characteristics and sealing performance. Butterfly valves can transport slurry with minimal liquid accumulation at the pipeline port. They achieve good sealing under low pressure and have excellent regulating performance. The streamlined design of the butterfly plate minimizes fluid resistance loss, making it an energy-saving product. The valve stem is a through-stem structure, heat-treated for good comprehensive mechanical properties, corrosion resistance, and abrasion resistance. During valve operation, the valve stem only rotates without lifting, so the stem packing is less prone to wear, ensuring reliable sealing. The stem is fixed to the butterfly plate with a taper pin, and the external end is designed to prevent blowout, avoiding accidental stem ejection if the connection between the valve stem and butterfly plate breaks. Connection methods include flange connection, wafer connection, butt weld connection, and lug-type wafer connection. Drive methods include manual, worm gear, electric, pneumatic, hydraulic, and electro-hydraulic actuators, enabling remote control and automated operation.

Advantages of extended stem butterfly valves:

1. Easy and quick opening and closing, labor-saving, low fluid resistance, suitable for frequent operation.

2. Simple structure, small size, light weight.

3. Capable of transporting slurry with minimal liquid accumulation at the pipeline port.

4. Good sealing under low pressure.

5. Excellent regulating performance.