Q641FPn16-pn25 pneumatic O-type regulating ball valve is a kind of rotary valve with the angle of 0-90 ° with excellent sealing performance, large flow coefficient, small flow resistance coefficient, simple structure, long service life and easy maintenance. The pneumatic regulating ball valve is driven by compressed air, and the valve core is driven by the valve stem to rotate 90 ° in the valve body, which can realize the action of full opening and full closing.

1. Small fluid resistance, ball valve is a kind of small fluid resistance in all kinds of valves, even the reduced ball valve, its fluid resistance is quite small.
2. The thrust bearing can reduce the friction torque of the valve stem and make the valve stem operate stably and flexibly for a long time.
3. The sealing performance of the valve seat is good, and the sealing ring made of polytetrafluoroethylene is easy to seal, and the sealing capacity of ball valve increases with the increase of medium pressure.
4. The valve rod seal is reliable. Because the valve rod only rotates and does not move up and down, the packing seal of the valve rod is not easy to be damaged, and the sealing capacity increases with the increase of medium pressure.
5. As PTFE and other materials have good self-lubricating property, the friction loss with the ball is small, and the service life of the ball valve is long.
6. The bottom mounted valve stem and the convex step at the head of the valve stem can prevent the valve stem from ejecting out. If the valve rod seal is damaged due to fire, metal contact can be formed between the convex step and the valve body to ensure the valve stem seal.

Q641FMain technical parameters of type O pneumatic regulating ball valve PN16 ～ PN25

Nominal diameter DN(mm)	15	20	25	32	40	50	65	80	100	125	150	200
Rated flow coefficientKV	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
Valve body form	Two stage cast ball valve
Connection form	Flange type, welding type, clamp type, thread type
Spool form	"O" type spherical valve core
Packing	V-type PTFE packing, flexible graphite packing, etc
Flow characteristics	Approximate quick opening type
Range of motion	0～90°
Leakage Q	According to GB / t4213-92, less than rated kv0.01%
	With positioner: less than ± 2% of full stroke
Return difference	With positioner: less than 2% of full stroke

Q641F Main dimensions of PN16 ～ PN25 pneumatic O-type regulating ball valve（mm)

Nominal diameter DN(mm)	Main dimensions			Flange size
				PN1.6MPa				PN2.5MPa
	L	H	W	D	D1	D2	n-φd	D	D1	D2	n-φd
15	130	185	140	95	65	46	4-14	95	65	46	4-14
20	140	191	140	105	75	45	4-14	105	75	56	4-14
25	150	193	140	115	85	65	4-14	115	85	65	4-14
32	165	212	164	140	100	76	4-18	140	100	76	4-18
40	180	217	164	150	110	84	4-18	150	110	84	4-18
50	200	260	190	165	125	99	4-18	165	125	99	4-18
65	220	293	210	185	145	118	4-18	185	145	118	8-18
80	250	323	247	200	160	132	8-18	200	160	132	8-18
100	280	382	276	220	180	156	8-18	235	190	156	8-22
125	320	468	348	250	210	184	8-18	270	220	184	8-26
150	360	510	378	285	240	211	8-22	300	250	211	8-26
200	400	655	524	340	295	266	12-22	360	310	274	12-26
250	630	/	/	405	355	319	12-26	425	370	330	12-30
300	750	/	/	460	410	370	12-26	485	430	389	16-30

 

Preparation before installation of pneumatic ball valve:
1. Ensure that the installation position of the pneumatic pipeline ball valve is in the coaxial position, and the two flanges on the pipeline shall be kept parallel to confirm that the pipeline can bear the weight of the pneumatic pipeline ball valve. If it is found that the pipeline can not bear the weight of the pneumatic pipeline ball valve, the corresponding support shall be provided for the pipeline before installation.
2. To confirm whether there are impurities and welding slag in the pipeline, the pipeline must be blown clean.
3. Check the name plate of the pneumatic pipeline ball valve, and operate the pneumatic pipeline ball valve fully open and closed for several times to confirm that the valve can work normally, and then check all details of the valve once again to ensure that the valve is intact.
4. Remove the protective covers at both ends of the valve, check whether the valve body is clean, and clean the inner cavity of the valve body. Since the sealing surface of the ball valve in the pneumatic pipeline is ball shaped, even small impurities may cause damage to the sealing surface.
Installation of pneumatic pipeline ball valve:
1. Any section of the pneumatic pipeline ball valve can be installed at the upstream end, and the handle pneumatic pipeline ball valve can be installed at any position of the pipeline. If the pneumatic pipeline ball valve with actuator (such as gearbox and electro pneumatic actuator) is equipped, it must be vertically installed, and the inlet and outlet of the valve shall be in horizontal position.
2. The sealing gasket shall be installed between the flange of the ball valve and the flange of the pipeline according to the design requirements of the pipeline.
3. The bolts on the flange shall be tightened symmetrically, successively and evenly.
4. If pneumatic and electric actuators are adopted for pneumatic pipeline ball valve, the installation of air source and power supply shall be completed according to the manual.
Inspection after installation of pneumatic pipeline ball valve:
1. After the installation, start the pneumatic pipeline ball valve to open and close several times. The action should be flexible and the force should be uniform. The pneumatic pipeline ball valve should work normally.
2. According to the design requirements of the pipeline pressure, the sealing performance of the joint surface between the pneumatic pipeline ball valve and the pipe flange is tested after pressurization.