Marine Wafer Type Eccentric Butterfly Valve / Center Type Turbine Butterfly Valve GB/T3037-94

Shanghai Yunlong Marine Valves 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-splash 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. Inside the precision fully enclosed electromechanical device, there is a mechanical indicator 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.

Structure type: Centerline type, double-eccentric type

Product 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 type

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, clamp. 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, 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, fast 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 aesthetic, strong * corrosion resistance.

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

7. Fully compliant with **** standards: Output shaft slots, 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, 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 a type of simple regulating valve, also 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, 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 inside the valve body to achieve opening, closing, or regulation. The full open to full close rotation 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 added to the valve stem. Using a worm gear reducer not only gives the butterfly plate self-locking ability, allowing it to stop at any position, but also **** the valve's operating performance. Industrial butterfly valves are characterized by high-temperature resistance, applicable to higher pressure ranges, large nominal diameters, carbon steel valve bodies, and metal rings replacing rubber rings for the valve plate seal. Large high-temperature butterfly valves are made of welded steel plates, mainly used for high-temperature media in flue gas and gas pipelines. Under normal conditions, the seal life 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 there is an elbow on the inlet side of the valve, creating biased flow, the torque increases. When the valve is at intermediate opening, the hydrodynamic torque comes into play, requiring the operating mechanism to self-lock. Butterfly valves feature simple structure, small size, light weight, low material consumption, small installation dimensions, quick switching, 90° reciprocating rotation, low driving torque, etc., used for cutting off, connecting, and regulating media in pipelines, with good fluid control characteristics and sealing performance. Butterfly valves can transport slurry, with minimal liquid accumulation at the pipeline port. Good sealing can be achieved at low pressure. Good regulating performance. The streamlined design of the butterfly plate results in low 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 * damaged, ensuring reliable sealing. Fixed to the butterfly plate with a taper pin, the external end is designed to prevent blowout, avoiding valve stem ejection in case of accidental fracture at the connection. Connection methods include flange connection, wafer connection, butt weld connection, and lug-type wafer connection. Drive types include manual, worm gear, electric, pneumatic, hydraulic, electro-hydraulic actuators, enabling remote control and automated operation.

Advantages of extended stem butterfly valves:

1. Easy and quick to open and close, 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 can be achieved at low pressure.

5. Good regulating performance.