Part name

Texture of material

Advantages / Disadvantages

Valve Body

Bronze

Pressure resistance, wear resistance and toughness are higher than those of brass, and bronze can delay the rust time of the valve to a certain extent. The price is higher than that of brass (recommended for longer service life).

Brass

Brass has low pressure resistance and is easy to rust. Price is lower than bronze.

Spool

Bronze

Bronze has excellent low temperature resistance, good corrosion resistance, wear resistance, castability and excellent mechanical properties.

Brass

Low price, high strength, hardness and poor plasticity, but it can still withstand pressure processing under heat, with general corrosion resistance.

Valve Stem

Bronze

Effective high strength and wear resistance, hardness can be improved after quenching, and the cost is higher than brass.

Brass

It has high strength, toughness and good friction reduction. It has high corrosion resistance in weather and sea water, but has the tendency of corrosion cracking.

Valve Cover

Bronze

It has good high-temperature corrosion resistance and oxidation resistance. It has good corrosion resistance in the atmosphere, fresh water and sea water. It has good machinability, can be welded and is not easy to braze. It has good pressure processing under hot state.

Brass

It has good mechanical properties, good plasticity in hot state and cold state, good machinability, easy brazing and welding, corrosion resistance, but easy to produce corrosion cracking.

Handwheel

Csat Iron

The cost is lower than that of bronze and cast steel.

Product drawings of other low-quality suppliers

Our factory manufactures products

Other low quality suppliers

Consequence

Our factory

Result

In order to reduce the cost, omit raw materials and reduce the internal quality, resulting in the thin wall of the valve body accounting for the main body of the valve

Leaving safety potential risk, the thin wall is easy to fracture or leak the valve under high temperature and high pressure or in operation

It is processed in strict accordance with the standard, with uniform thickness and material

It is safe to use, meets the needs of users, and has a long service life

The valve cover has poor manufacturing quality, uneven thickness and uneven material

The valve cover is prone to damage, sand holes, corrosion or aging

It is processed in strict accordance with the standard, with uniform thickness and material

The valve cover is of good quality, not easy to produce pores, and the product has a long service life

Refurbishment of valves, some operators through the second sale of waste valves after repainting, has brought serious safety hazards to the project quality

The refurbished valve can easily cause shell cracking, and the phenomena of running, emitting, dripping and leakage will occur, which will cause oil and gas pipeline explosions in serious cases

Make new valves in strict accordance with the material requirements of customers, and never substitute inferior products for good ones

Meet the hardness and accuracy requirements of standard valves, ensure the quality of valves and ensure the normal operation of equipment

Flange manufacturing quality is poor, with cracks, pores, insufficient thickness and other problems

It leads to wear resistance and poor pressure bearing of the valve, and the valve is prone to quality problems, which makes

short service life

Materials shall be selected in strict accordance with national standards

The valve has good wear resistance and pressure bearing performance and is not easy to be damaged

Replace copper valve rod with stem plated valve stem

The performance of substitute materials is unstable, resulting in the decline of valve quality

Select materials in strict accordance with user requirements

High safety factor, reasonable structure and long service life of products

The filler is of poor quality, with defects such as loose filler, hairiness, dryness and impurities

Lead to packing failure, easy to cause medium leakage, and easy to cause valve failure

Select high-quality filler, and there is no looseness, impurities and other phenomena

The valve has good sealing and wear resistance, which is not easy to produce the phenomenon of medium leakage, and the service life of the valve is longer

The hardness of the valve stem is too low, there are cracks, is not round, and is not bent straight

The sealing surface of the valve stem is easy to be damaged and the service life of the valve is short

Select materials according to standards and customer requirements

The valve stem has high hardness, no cracks, good sealing performance and long service life

In order to reduce the cost, the bronze valve core is replaced by cast iron valve core

Cast iron valve core is easy to be corroded and damaged

Select materials in strict accordance with user requirements

High safety factor and reasonable structure

Drawing

① Body: Bronze (BC6)

② Disc: Bronze (BC6)

③ Brass: Stem C3771BD