Q641F, Q641FH Pneumatic Flanged Ball Valve
The Q641F/H pneumatic flange 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.
Product Name: Pneumatic Flanged Ball Valve
Product Model: Q641F/H
Nominal Diameter: DN15～DN400
Structure Type: Spherical
Nominal Pressure: 1.6Mpa～32.0Mpa
Connection Method: Flanged, Wafer, Threaded, Welded
Applicable Temperature: ≤550ºC
Actuation Method: Pneumatic (manual operation also possible)
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, Q641FH Pneumatic Flanged Ball Valve Product features
(1) The fluid resistance is small. The ball valve has the smallest fluid resistance among all valves. Even the reduced diameter ball valve has a very small fluid resistance.
(2) The thrust bearing reduces the friction torque of the valve stem, making the valve stem’s long-term operation balanced and flexible.
(3) The valve seat has good sealing performance, and the sealing ring made of polytetrafluoroethylene and other materials is used. The structure is easy to seal, and the valve sealing capacity of the ball valve increases with the increase of the medium pressure.
(4) The valve stem seal is reliable. Since the valve stem only rotates and does not move up and down, the packing seal of the valve stem is not easily damaged, and the sealing capacity increases with the increase of the pressure of the medium.
(5) Since materials such as polytetrafluoroethylene have good self-lubricating properties, the friction loss with the ball is small, which helps the ball valve have a long service life.
(6) The bottom-mounted valve stem and the convex steps on the valve stem head prevent the valve stem from spraying out. If the valve stem seal is damaged due to fire, metal contact can also be formed between the convex steps and the valve body to ensure the valve stem sealing.
Q641F, Q641FH Pneumatic Flanged Ball Valve 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 pressure difference (MPa) ≤ nominal pressure
Valve body type two-stage cast ball valve
Connection form flange type, welding type, threaded type
Valve core form “O” type spherical valve core
Sealing packing V-type polytetrafluoroethylene packing, flexible graphite packing, etc.
Flow characteristics: Approximate quick-opening type
Movement 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 can be equipped with GT, SR, ST, AT, AW and other series of pneumatic actuators
Control mode: switch type (two-position switch control), regulating type (4~20mA control)
Q641F, Q641FH Pneumatic Flanged Ball Valve 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℃
Functional form: single-acting actuator: air-closed type (B)–the valve position is open (FO) when the air is lost; air-opening type (K)–the valve position is closed (FC) when the air is lost.
Double-acting actuator: air-closing type (B)–the valve position is maintained when the air is lost (FL); air-opening type (K)–the valve position is maintained when the air is lost (FL)
Can be equipped with accessories: positioner, solenoid valve, air filter pressure reducer, position retaining valve, travel switch, valve position transmitter, handwheel mechanism, etc.
Q641F, Q641FH Pneumatic Flanged Ball Valve Part material
Part name Material
Valve body WCB 304(CF8) 316(CF8M) 316L(CF3M)
Sphere 2Cr13+ nitriding treatment 304 316 316L
Valve stem 2Cr13 304 316 316L
Valve seat seal: PTFE (polytetrafluoroethylene), PPL (para-polyphenylene), metal seal (tungsten carbide)
Filling V-type PTFE PTFE filler, 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°C), acetic acid (temperature ≤ 200°C)
Pneumatic actuator main component materials
Part name Cylinder block End cover Piston Shaft O-ring Indicator shaft Bolt
QW series
AT series aluminum alloy profiles
(hard anodized) die-cast aluminum alloy
(Epoxy resin spray) Die-cast aluminum Steel
(Nickel-phosphorus alloy plating) NBR ABC SUS304
AW series cast steel
(hard anodized) die-cast aluminum steel
(Nickel-phosphorus alloy plating) NBR ABC SUS304
