China high quality Worm Gear Drive Ductile Iron Ggg50 DN300 Pn10 Flange Double Eccentric Butterfly Valve with Great quality

Product Description

    Gear Drive Ductile Iron Ggg50 Dn300 Pn10 Flange Double Eccentric Butterfly Valve

Nominal Diameter: DN100-DN3600

Nominal Strain: 10Bar/16Bar/150lbs/25bar

Layout Normal:  BS EN593/BS5155/API609/DIN3354

FTF Dimension:  ISO 5752 Collection thirteen&14 /BS EN558 Sequence thirteen&fourteen /API609/DIN3202/ASME B16.ten

Flange Link: ASME B16.1 Class125/ASME B16.5 CL150/ASME B16.47 CL150/AWWA C207/

                             DIN 2501 PN10-16-25/EN1092 PN10-sixteen-25

Inspection and Test:    EN12266-1/API 598/ISO5208

Content checklist:

  1. Entire body
  •     Ductile Iron:   ASTM A536 sixty-forty-eighteen/ DIN1693 GGG40,GGG50
  •     Carbon Metal:  ASTM A216 WCB
  •     Stainless Metal:  ASTM A351 CF8/CF8M

      2. Disc

  •     Ductile Iron:    ASTM A536 sixty-40-18/ DIN1693 GGG40,GGG50
  •     Carbon Metal:   ASTM A216 WCB
  •     Stainless Metal :  ASTM A351 CF8/CF8M
  •     Bronze AL-Bronze: ASTM B148 C954 

      3. Stem

  •     Stainless Metal:    ASTM A182 304/316/410
  •     Alloy:           Monel K500

       4. Seat                        SS304/SS316/Brass
       5. Sealing Ring          EPDM/NBR
       6. Retaining Ring       Carbon Metal/SS304/SS316
       7. Screw                     Carbon Metal/SS201/SS304/SS316
       8. Packing                 NBR/EPDM/VITON/Adaptable Graphite
       9. Yoke                     Cast Iron/Carbon Metal
      10. Bushing               PTFE/Bronze
      11. Pin

  •       Stainless Steel     ASTM A182 304/316/410
  •       Alloy                Monel K500

Some Ending Clientele

Advantages of Double eccentric Butterfly Valve

one. The double eccentric butterfly valve shaft is put offset to 1 aspect of the valve centerline. The benefits of this valve compared to a single eccentric are that the valve seat and the disk will not get in touch with whilst touring. The disc will cam away from the seat while opened, and make contact with is not set up before the ultimate shut off position.

2. The double eccentric variety is the variation of the strain-location on the disc. Since the stem is offset to 1 side the strain area will be marginally even bigger on 1 side of the shaft. If the valve mounted in the desired path the method pressure will aid the valve making a better sealing.

3. Modest operation torque of big size butterfly valve



We do not have any MOQ for this valve, one set get is also can be acknowledged.


It is dependent on the purchase amount, but not more than 35-40days after gained payment

Payment way

30% deposit, the balance will be paid ahead of loading.

Hydraulic testing

We promise a hundred% hydraulic screening before exporting, with a testing device and testing bowl(for large measurement).

Entire body tests: 1.5* style stress

Sealing screening 1.1* design force

We can offer a 12-month warranty after the transport date.


Packing way

Plywood case in exporting standard, bubble plastic packing inside

For huge dimensions, we will use metal pallet with bubble plastic packing outside the house

Our Overseas Exhibition 


Or you can visit our internet site: davanflowtek


An Overview of Worm Shafts and Gears

This article offers an overview of worm shafts and gears, including the type of toothing and deflection they experience. Other topics coated consist of the use of aluminum vs . bronze worm shafts, calculating worm shaft deflection and lubrication. A comprehensive understanding of these problems will help you to style better gearboxes and other worm gear mechanisms. For even more information, make sure you check out the connected web sites. We also hope that you will uncover this report useful.
worm shaft

Double throat worm gears

The pitch diameter of a worm and the pitch of its worm wheel must be equivalent. The two varieties of worm gears have the same pitch diameter, but the distinction lies in their axial and round pitches. The pitch diameter is the length between the worm’s enamel along its axis and the pitch diameter of the greater gear. Worms are produced with left-handed or correct-handed threads. The direct of the worm is the distance a stage on the thread travels throughout 1 revolution of the worm gear. The backlash measurement must be produced in a number of diverse spots on the equipment wheel, as a large amount of backlash indicates tooth spacing.
A double-throat worm gear is created for substantial-load applications. It gives the tightest connection amongst worm and gear. It is crucial to mount a worm equipment assembly properly. The keyway design and style demands a number of points of speak to, which block shaft rotation and aid transfer torque to the gear. Following identifying the location of the keyway, a gap is drilled into the hub, which is then screwed into the gear.
The dual-threaded style of worm gears makes it possible for them to endure large masses with out slipping or tearing out of the worm. A double-throat worm gear supplies the tightest connection in between worm and equipment, and is for that reason best for hoisting applications. The self-locking mother nature of the worm gear is an additional advantage. If the worm gears are made well, they are superb for minimizing speeds, as they are self-locking.
When selecting a worm, the quantity of threads that a worm has is critical. Thread begins decide the reduction ratio of a pair, so the larger the threads, the better the ratio. The very same is real for the worm helix angles, which can be one particular, two, or three threads lengthy. This differs between a solitary thread and a double-throat worm equipment, and it is crucial to take into account the helix angle when picking a worm.
Double-throat worm gears vary in their profile from the genuine equipment. Double-throat worm gears are particularly valuable in purposes where sound is an situation. In addition to their minimal sounds, worm gears can absorb shock loads. A double-throat worm gear is also a well-known selection for several various types of applications. These gears are also commonly utilised for hoisting equipment. Its tooth profile is diverse from that of the true gear.
worm shaft

Bronze or aluminum worm shafts

When selecting a worm, a few factors should be stored in mind. The materials of the shaft must be possibly bronze or aluminum. The worm itself is the main component, but there are also addendum gears that are accessible. The whole number of teeth on each the worm and the addendum equipment must be greater than forty. The axial pitch of the worm demands to match the circular pitch of the greater equipment.
The most common materials utilized for worm gears is bronze simply because of its fascinating mechanical homes. Bronze is a broad time period referring to a variety of copper alloys, like copper-nickel and copper-aluminum. Bronze is most frequently developed by alloying copper with tin and aluminum. In some cases, this mix results in brass, which is a similar metallic to bronze. The latter is much less high-priced and suited for light masses.
There are a lot of rewards to bronze worm gears. They are robust and resilient, and they offer excellent wear-resistance. In distinction to metal worms, bronze worm gears are quieter than their counterparts. They also call for no lubrication and are corrosion-resistant. Bronze worms are popular with tiny, light-weight-fat equipment, as they are effortless to sustain. You can read more about worm gears in CZPT’s CZPT.
Despite the fact that bronze or aluminum worm shafts are the most typical, both supplies are equally suited for a selection of purposes. A bronze shaft is frequently referred to as bronze but may in fact be brass. Historically, worm gears ended up produced of SAE sixty five gear bronze. Nonetheless, newer materials have been released. SAE sixty five equipment bronze (UNS C90700) remains the preferred content. For substantial-volume applications, the material financial savings can be significant.
Each kinds of worms are primarily the same in size and form, but the lead on the still left and appropriate tooth surfaces can differ. This makes it possible for for exact adjustment of the backlash on a worm without having altering the heart length among the worm equipment. The different measurements of worms also make them less difficult to manufacture and maintain. But if you want an specially little worm for an industrial application, you ought to consider bronze or aluminum.

Calculation of worm shaft deflection

The centre-line length of a worm gear and the variety of worm tooth enjoy a critical position in the deflection of the rotor. These parameters should be entered into the resource in the same units as the main calculation. The selected variant is then transferred to the principal calculation. The deflection of the worm gear can be calculated from the angle at which the worm tooth shrink. The subsequent calculation is valuable for designing a worm gear.
Worm gears are commonly utilised in industrial apps because of to their higher transmittable torques and big equipment ratios. Their tough/soft materials mix can make them preferably suited for a extensive selection of purposes. The worm shaft is normally made of circumstance-hardened steel, and the worm wheel is fabricated from a copper-tin-bronze alloy. In most instances, the wheel is the area of make contact with with the gear. Worm gears also have a reduced deflection, as high shaft deflection can influence the transmission precision and improve put on.
Another strategy for determining worm shaft deflection is to use the tooth-dependent bending stiffness of a worm gear’s toothing. By calculating the stiffness of the specific sections of a worm shaft, the stiffness of the entire worm can be identified. The approximate tooth area is demonstrated in determine 5.
One more way to determine worm shaft deflection is by making use of the FEM method. The simulation instrument uses an analytical design of the worm equipment shaft to figure out the deflection of the worm. It is based mostly on a two-dimensional product, which is much more appropriate for simulation. Then, you need to have to enter the worm gear’s pitch angle and the toothing to compute the highest deflection.
worm shaft

Lubrication of worm shafts

In purchase to shield the gears, worm drives require lubricants that supply excellent anti-put on security, higher oxidation resistance, and lower friction. While mineral oil lubricants are broadly used, artificial base oils have greater efficiency traits and decrease operating temperatures. The Arrhenius Rate Rule states that chemical reactions double each and every 10 levels C. Artificial lubricants are the greatest choice for these programs.
Synthetics and compounded mineral oils are the most well-known lubricants for worm gears. These oils are formulated with mineral basestock and 4 to six per cent synthetic fatty acid. Surface-energetic additives give compounded equipment oils fantastic lubricity and avert sliding dress in. These oils are suited for high-pace programs, like worm gears. Nonetheless, artificial oil has the drawback of currently being incompatible with polycarbonate and some paints.
Artificial lubricants are high-priced, but they can enhance worm gear performance and operating lifestyle. Artificial lubricants generally fall into two categories: PAO synthetic oils and EP synthetic oils. The latter has a higher viscosity index and can be used at a variety of temperatures. Artificial lubricants frequently have anti-put on additives and EP (anti-use).
Worm gears are regularly mounted in excess of or beneath the gearbox. The proper lubrication is essential to ensure the correct mounting and procedure. Frequently, insufficient lubrication can lead to the device to are unsuccessful faster than envisioned. Simply because of this, a technician may not make a connection among the lack of lube and the failure of the device. It is crucial to follow the manufacturer’s recommendations and use large-top quality lubricant for your gearbox.
Worm drives reduce backlash by minimizing the engage in between gear enamel. Backlash can lead to injury if unbalanced forces are introduced. Worm drives are lightweight and durable since they have nominal moving components. In addition, worm drives are lower-noise and vibration. In addition, their sliding movement scrapes away extra lubricant. The continuous sliding action generates a substantial amount of warmth, which is why superior lubrication is essential.
Oils with a high movie strength and excellent adhesion are perfect for lubrication of worm gears. Some of these oils have sulfur, which can etch a bronze gear. In buy to stay away from this, it is crucial to use a lubricant that has higher movie energy and stops asperities from welding. The ideal lubricant for worm gears is one that offers outstanding film strength and does not incorporate sulfur.

China high quality Worm Gear Drive Ductile Iron Ggg50 DN300 Pn10 Flange Double Eccentric Butterfly Valve     with Great qualityChina high quality Worm Gear Drive Ductile Iron Ggg50 DN300 Pn10 Flange Double Eccentric Butterfly Valve     with Great quality