Marine Electric Regulating Butterfly Valve / Centric Flange Butterfly Valve CB/T4173-2011

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, globe 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, voltage: AC/DC universal

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% (1/4 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, directly connected to the valve stem for transmission. Inside the precision fully enclosed electromechanical device, there is a mechanical indicator for valve opening, imported electrical components, and anti-rust 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.

Structure type: Centerline type, double-eccentric type

Product type: Type A, Type B, Type AS, Type BS, Type CS, Type SX, Type ES, Type QS, Type DS, Type FSB, Type FA, Type FB, Type FD, Type 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 Department JB, Chemical standard HG, American standard API, ANSI, German standard DIN, Japanese JIS, JPI, British standard 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, clamp. Drive methods: Manual, pneumatic, hydraulic, electric.

Marine butterfly valves, marine manual butterfly valves, marine spiral butterfly valves, marine lug-type butterfly valves, marine electric butterfly valves, marine pneumatic butterfly valves, marine hydraulic butterfly valves, marine worm gear butterfly valves, marine stainless steel butterfly valves, marine bronze butterfly valves, marine flanged butterfly valves, marine double-eccentric butterfly valves.



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. * 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 groove, 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 for ships, 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 opening and closing element is a disc-shaped butterfly plate that rotates around its own axis within 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 * the butterfly plate, a worm gear reducer is installed on the valve stem. Using a worm gear reducer not only allows the butterfly plate to self-lock and stop at any position but also **** the valve's operating performance. Industrial butterfly valves are characterized by high-temperature resistance, suitability for higher pressure ranges, large nominal diameters, carbon steel valve bodies, and metal rings instead of rubber rings for the valve plate seal. Large high-temperature butterfly valves are manufactured by welding steel plates and are mainly used for high-temperature media in flue gas and gas pipelines. Under normal conditions, the service life of the seal 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 on 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, creating biased flow, the torque increases. When the valve is at an intermediate opening, due to the effect of hydrodynamic torque, the operating mechanism needs to self-lock. 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. Under low pressure, they can achieve good sealing. They have good 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, tempered for good comprehensive mechanical properties and * corrosion and * abrasion resistance. During valve operation, the valve stem only rotates without lifting, so the stem packing is not easily * and sealing is reliable. It is fixed with the butterfly plate via a taper pin, and the external end is designed to prevent blowout, avoiding accidental valve 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. Can transport slurry with minimal liquid accumulation at the pipeline port.

4. Good sealing under low pressure.

5. Excellent regulating performance.