Name of Parts

Material

Advantages/Disadvantages

Valve Body

Bronze

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

Cast Steel

The price of cast steel is lower than that of bronze, and it has better plasticity and toughness, which is manifested in good elongation, reduction of area and impact toughness.

Cast Iron

The price of cast iron is lower than bronze and cast steel, the cost is lower, the wear resistance is good but the corrosion resistance of cast iron is low

Valve Bonnet

Bronze

Seawater corrosion resistance, a little more expensive than cast steel and cast iron

Cast Steel

Cast carbon steel has higher strength, ductility and toughness at lower cost

Cast Iron

Cast iron is less expensive. Casting performance of cast iron, machinability, friction reduction, good vibration damping performance, low notch sensitivity

Valve Disc

Bronze

Bronze has excellent low temperature resistance, the price is a little more expensive than stainless steel, and the seawater resistance of bronze is better than that of stainless steel

Stainless Steel

Stainless steel corrosion resistance is good, more durable than ordinary steel; Easy plastic processing; Good welding performance;

Valve Stem

Stainless Steel 304

The price is relatively cheap. 304 stainless steel is the most common type of steel. The biggest feature is acid resistance, alkali resistance and high temperature resistance. It also has good performance in hot workability such as stamping and bending.

Stainless Steel 316

The price of stainless steel 316 is higher than that of 304. On the basis of 304 stainless steel, 316 stainless steel adds molybdenum element, which will have stronger corrosion resistance.

Hand Wheel

Cast Iron

Cost less than bronze and cast steel

Comparison

Product Picture of other low quality supplier

Product Picture of our factory

Other low quality supplier

Consequence

Our Factory

Result

In order to reduce costs and save raw materials, the thickness of the valve body is not processed according to the standard

The valve body is easy to be damaged, and the service cycle is shortened; there is a potential safety hazard

Processed strictly according to the standard

Meet the standard requirements, the valve will last longer

The quality of the valve cover is poor, the material is not uniform, and it does not meet the standard requirements

Bonnets are prone to breakage, blisters, corrosion or aging problems

Processed strictly according to the standard

The quality of the valve cover is good, it is not easy to generate air holes, and the product has a long service life.

To save cost, bronze spool is replaced with cast iron spool,

Cast iron valve core is easy to corrode and break

Production in strict accordance with customer requirements and standards

High safety factor and reasonable structure

Replace the copper stem with an iron-copper-plated stem

The performance of the substitute material is unstable, resulting in a decrease in the quality of the valve.

Strictly select materials according to user requirements

High safety factor, reasonable structure, long product life

Poor filler quality, there are defects such as loose fillers, burrs, dryness, impurities, etc.

Lead to packing failure, easy to produce medium leakage, valve easy to malfunction.

High-quality fillers are selected, and there is no loose, impurity and other phenomena.

The valve has good sealing and wear resistance, and it is not easy to cause leakage of the medium, and the valve has a longer service life.

Product Pressure

5K, 10K

Standard

JIS

Medium

Air, gas, oil,etc.

Nominal Diameter

15-65,50-400

Brand name

Customer required

Material

Bronze,cast iron, cast steel

Application

Shipbuilding,ship repair

OEM service

Available

Certificate

ABS, BV, CCS, LR, RINA