Q641F Pneumatic Ball Valve US API
Pneumatic ball valves have advantages such as compact structure, small size, reliable operation, low flow resistance coefficient, good sealing performance, easy maintenance, convenient installation, and strong adaptability.
The Q641F/H pneumatic ball valve consists of a high-precision pneumatic actuator and a precision-cast ball valve. It is mainly divided into two categories: pneumatic soft-seal ball valves (≤200°) and pneumatic hard-seal ball valves (≤550°). Pneumatic ball valves have advantages such as compact structure, small size, reliable operation, low flow resistance coefficient, good sealing performance, easy maintenance, convenient installation, and strong adaptability. Pneumatic ball valves can be equipped with travel limit switches, solenoid valves, pressure reducing valves, and a 0.4-0.7MPa air source to achieve on/off operation, and send two pairs of passive contact signals to indicate the valve’s opening and closing. Pneumatic flange ball valves are particularly suitable for applications involving viscous, particulate, or fibrous media. Pneumatic ball valves are widely used in industrial automatic control systems in petroleum, chemical, educational equipment, light industry, high-pressure equipment, pharmaceutical, and papermaking industries for remote centralized control or local control.
Product Name: Pneumatic Ball Valve
Product Model: Q641F/H
Nominal Diameter: DN15～DN400
Structure: Spherical
Nominal Pressure: 1.6Mpa～32.0Mpa
Connection Method: Flange, Wafer, Threaded, Welded
Applicable Temperature: ≤550ºC
Actuation Method: Pneumatic (manual operation also available)
Valve Body Material: Cast Steel, Stainless Steel
Manufacturing Standard: GB (Chinese National Standard), DIN (German Standard), API (American Standard), ANSI (American Standard)
Applicable Media: Water, Oil, Gas, Liquid
Manufacturer: Zhejiang Kozo Valve Co., Ltd.
Q641F Pneumatic Ball Valve US API Product Features
(1) Low fluid resistance: Ball valves have the lowest fluid resistance of all valve types. Even reduced-bore ball valves have very low fluid resistance.
(2) Thrust bearings reduce stem friction torque, ensuring balanced and flexible operation of the stem over long periods.
(3) Excellent seat sealing performance: The sealing rings, made of materials such as PTFE, are easy to seal, and the sealing capacity of the ball valve increases with increasing medium pressure.
(4) Reliable stem sealing: Because the stem only rotates and does not move up or down, the stem packing seal is not easily damaged, and the sealing capacity increases with increasing medium pressure.
(5) Due to the good self-lubricating properties of materials such as PTFE, friction loss with the ball is low, extending the service life of the ball valve.
(6) The bottom-mounted stem and the raised step on the stem head prevent the stem from being ejected. If a fire causes damage to the stem seal, the raised step can still form metal-to-metal contact with the valve body, ensuring the stem seal.
Technical Parameters
Nominal Diameter DN (mm): 15 20 25 32 40 50 65 80 100 125 150 200
Rated Flow Coefficient KV: 21 38 72 112 170 273 384 512 940 1452 2222 3589
Nominal Pressure (MPa): PN1.6, 2.5, 4.0, 6.4 MPa; ANSI 150, 300LB
Allowable Differential Pressure (MPa): ≤Nominal Pressure
Valve Body Type: Two-stage cast ball valve
Connection Type: Flanged, welded, threaded
Valve Core Type: “O” type ball valve core
Sealing Packing: V-type PTFE packing, flexible graphite packing, etc.
Flow Characteristics: Approximately quick-opening type
Operating Range: 0～90°
Leakage Q According to GB/T4213-92, less than 0.01% of rated KV
Adjustable range: 250:1 350:1
Configuration actuator: Compatible with GT, SR, ST, AT, AW series pneumatic actuators
Control method: On/off type (two-position on/off control), regulating type (4～20mA control)
Actuator parameters:
Actuator model: GT, AT, AR, AW series single and double-acting pneumatic actuators
Air supply pressure: 0.4～0.7MPa
Air source interface: G1/4″, G1/8″, G3/8″, G1/2″
Ambient temperature: -30～+70℃
Action type: Single-acting actuator: Air-to-close (B) — valve position open (FO) when air is lost; Air-to-open (K) — valve position closed (FC) when air is lost
Double-acting actuator: Air-to-close (B) — valve position held (FL) when air is lost; Air-to-open (K) — Valve Position Holding (FL) in case of air loss. Optional accessories include positioners, solenoid valves, air filter regulators, position holding valves, limit switches, valve position transmitters, and handwheel mechanisms.
Part Materials
Part Name Material
Valve Body WCB 304(CF8) 316(CF8M) 316L(CF3M)
Ball 2Cr13 + Nitrided 304 316 316L
Valve Stem 2Cr13 304 316 316L
Valve Seat Seal PTFE (Polytetrafluoroethylene), PPL (Polyphenylene PLC), Metal Seal (Hard Alloy)
Packaging V-type PTFE packing, Flexible Graphite
Performance Specifications
Nominal Diameter DN (mm) DN15-300
Nominal Pressure PN (MPa) 1.0 1.6 2.5 4.0 6.4
Test Pressure Strength Test 1.5 2.4 3.75 6.0 9.60
Sealing Test 1.1 1.76 2.75 4.4 7.04
Low Pressure Air Tightness Test 0.5～0.7
Applicable Media Water, oil, steam, nitric acid (temperature ≤200℃), acetic acid (temperature ≤200℃)
Main Component Materials of Pneumatic Actuators
Part Name Cylinder Body End Cover Piston Shaft O-ring Indicator Shaft Bolt
QW Series
AT Series Aluminum Alloy Profile
(Hard Anodized) Die-cast Aluminum Alloy
(Epoxy Resin Coating) Die-cast Aluminum Steel
(Nickel-phosphorus Plated) NBR ABC SUS304
AW Series Cast Steel
(Hard Anodized) Die-cast aluminum steel (nickel-phosphorus plated) NBR ABC SUS304
