Select the valve diameter must determine the connection with the valve nominalpipe size. Valve material in determining the correct valve material, should consider the following factors:

The fluid medium, the valve to control the 1

The temperature range of 2 · fluid medium

3, the valve will be subjected to the pressure range

4, may affect the valve climatic conditions

5, the valve will be subjected, possible abnormal pressure or stress

6, to meet the safety standards or piping codes

The control function of the valve. At each valve is used to play a functional structure, do not expect a kind of valve to within the system.

Pressure - temperature rating. In order to meet the actual needs, please pay special attention to the required valve pressure - temperature rating. Special attention should be paid to packing and gasket materials, these materials a considerable extent determines the temperature pressure valve ratings. According to the sealing materials as specified to actual needs, to meet or exceed the actual demand.

Valves and connections. Pipeline integrity, future maintenance, corrosion factors,field assembly, weight and safety factors are determined that the valve and pipe connections should be taken into account.

Operation or operation method to select the appropriate operating mode oroperation method according to valve type, size, pressure, temperature,environmental factors such as installation.

The valve ordering

Valves ordering, please provide the following information, avoid repeated and unnecessary delays, ensure that the purchase of the valve is required by its own valve.

1 valve size

2 the valve pressure, sealing surface material: the castings and components.

3 valve types: such as gate valve, globe valve, check valve, butterfly valve, ball valve, stainless steel, carbon steel and other materials, ductile iron, forged steeletc..

4 terminal connections, if the connection for the welding, but also to provide connection pipe wall thickness; if the connection is a flange, the flange will have to provide the surface or polishing degree.

5 any standard configuration of different materials: sealing materials, precipitationmaterial, bolt material, etc..

6 any attachments: acid shield, locking devices, chain operation, etc..

7 manual or power actuators: please include details of requirements.