Marine Center-Type Pneumatic Butterfly Valve Model Q GB3036-94

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-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

Suitable temperature: ≤80℃

Purpose: A valve opening/closing electrical signal device is installed at the top of the signal butterfly valve. When the valve is mistakenly closed by 25% (1/4 of the full opening), the electrical 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 electrical signal device of this butterfly valve is designed at the top of the worm gear drive device and is directly connected to the valve stem for transmission. Inside the precision fully enclosed electromechanical device, there are valve opening mechanical indicators, imported electrical components, and anti-rust mechanical parts. The output signal is stable and reliable.

Purpose 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 material: 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 method: Internal thread, external thread, flange, welding, butt welding, socket welding, clamp, clamp. Drive method: 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. Suitable temperature: -50℃—235℃

4. Drive form: 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, fast action.

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

4. *Gears and racks, small meshing clearance, high precision, large output power.

5. Stainless steel fasteners, safe and beautiful, strong *corrosion resistance.

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

7. *Complies 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, DIN3337 standards, facilitating the installation of accessories such as solenoid valves and limit switches.

4. Versatility

Widely used in pipelines of 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, mainly 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 in the valve body to achieve opening, closing, or regulation. The full open to full close rotation of an extended stem butterfly valve is usually less than 90°. Extended stem butterfly valves and the valve stem itself have no self-locking ability. To * the butterfly plate, a worm gear reducer must be installed on 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 **** improves the valve's operating performance. Industrial butterfly valves are characterized by high temperature resistance, suitable for higher pressure ranges, large nominal diameters, valve bodies made of carbon steel, and valve disc sealing rings made of metal instead of rubber. Large high-temperature butterfly valves are made of welded steel plates, mainly used for high-temperature media in 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 opening/closing. 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 due to water depth.

In addition, when there is an elbow on the inlet side of the valve, creating biased flow, the torque will increase. When the valve is at an intermediate opening, due to the effect of hydrodynamic torque, the operating mechanism needs to be self-locking. Butterfly valves have the characteristics of 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, with 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 results in low fluid resistance loss, making it an energy-saving product. The valve stem is a through-rod structure, tempered for good comprehensive mechanical properties and *corrosion and *abrasion resistance. When the butterfly valve opens or closes, the valve stem only rotates without lifting, so the valve stem packing is not easily * damaged, ensuring reliable sealing. The valve stem is fixed with the butterfly plate with a taper pin, and the external end is designed to prevent ejection, avoiding valve stem ejection in case of accidental breakage at the valve stem-butterfly plate connection. Connection methods include flange connection, wafer connection, butt weld connection, and lug wafer connection. Drive forms include manual, worm gear, electric, pneumatic, hydraulic, electro-hydraulic linkage, and other 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. Under low pressure, can achieve good sealing.

5. Good regulating performance.