Process Conditions (Core)

1. Service Medium

• Medium: water, steam, air, natural gas, oil, acid, alkali, slurry, etc.
• Particulate content, corrosiveness, crystallization tendency

2. Temperature

• Normal, maximum and minimum operating temperature

3. Pressure

• Normal operating pressure
• Maximum inlet pressure P1
• Outlet pressure P2
• Pressure drop ΔP across valve

4. Flow Rate

• Normal, maximum and minimum flow rate
• Unit: m³/h, t/h, kg/h, Nm³/h, etc.

Valve Body Parameters

1. Nominal Diameter (DN)
2. Pressure Class

• PN16/PN25/PN40/PN63 or Class150/300/600

3. Valve Body Material

• WCB, 304, 316, 316L, Hastelloy, titanium, PTFE lined, rubber lined, etc.

4. Trim Material (plug, seat, stem)

• 304, 316, 316L, Stellite overlay, Hastelloy, etc.

5. Packing

• V-type PTFE, flexible graphite, stainless steel bellows, etc.

6. Leakage Class

• Class IV, V, VI (bubble-tight shutoff)

Structure & Flow Characteristic

1. Valve Type

• Globe single-seat, double-seat, cage, three-way, angle, butterfly, ball, diaphragm, etc.

2. Flow Characteristic

• Equal percentage / Linear / Quick opening

3. Flow Direction

• Flow open / Flow close

4. Connection Type

• Flanged, welded, threaded, clamped

5. Special Requirements

• Jacketed for heating / Cooling fin / Bellows seal

1. Actuator
2. Type

• Pneumatic diaphragm / Pneumatic piston / Electric / Hydraulic

2. Action Mode

• Air-to-open (FO) / Air-to-close (FC)

3. Air Supply Pressure

• 4～0.6 MPa or others

4. Explosion-proof Requirement

• Ex d II CT4 / Ex ia, etc.

Accessories (Directly Affect Price)

1. Valve Positioner (smart/mechanical)
2. Solenoid Valve
3. Filter Regulator
4. Limit Switch (Feedback)
5. Handwheel
6. Lockup valve, booster, amplifier

Signal & Standards

1. Control Signal

• 4～20mA / HART / FF / Profibus

2. Executive Standards

• GB, HG, API, IEC, ANSI, etc.

3. Material Certificate & Hydrostatic Test

• Shell test, seal test