Q347Type pn16-pn25 worm gear manual eccentric hemisphere valve pn16-pn25 uses eccentric valve body, eccentric ball and valve seat. When the valve rod rotates, it will automatically center in the common track. The closer it is closed, the tighter it will be. The better the sealing performance can be achieved. The ball and valve seat of the valve are completely separated, which eliminates the wear of the sealing ring and overcomes the problem that the traditional ball valve seat and the sealing surface of the ball are always worn. The non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected. This product is especially suitable for steel industry, aluminum industry, fiber, small solid particles, pulp, coal ash, petroleum gas and other media.

Type pn16-pn25 worm gear manual eccentric hemisphere valve pn16-pn25 uses eccentric valve body, eccentric ball and valve seat.

When the valve rod rotates, it will automatically center in the common track. The closer it is closed, the tighter it will be.

The better the sealing performance can be achieved.

The ball and valve seat of the valve are completely separated, which eliminates the wear of the sealing ring and overcomes the problem that the traditional ball valve seat and the sealing surface of the ball are always worn.

The non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected.

This product is especially suitable for steel industry, aluminum industry, fiber, small solid particles, pulp, coal ash, petroleum gas and other media.

Q347Performance parameters of manual eccentric hemisphere valve PN16 ～ PN25

Nominal pressure（Mpa）	0.6	1.0	1.6	2.5	4.0
Nominal diameter（mm）	40－1600	40－1600	40－1200	40－600	40－600
Sealing test pressure（Mpa）	0.66	1.1	1.76	2.75	4.4
Shell test pressure（Mpa）	0.9	1.5	2.4	3.75	6.0
Applicable temperature（℃）	－29～300、－29～425、－29～540
Applicable media	Water, sea water, sewage, acid and alkali liquid, slurry, steam, gas, oil
Driving mode	Manual, electric, pneumatic
Connection form
	Vertical installation, horizontal installation

Q347Part materials of PN16 ～ PN25 type worm gear manual eccentric hemisphere valve

name	texture of material
valve body	QT450、WCB、ZG20CrMo、ZG1Cr18Ni9Ti
Valve shaft	2Cr13、1Cr13
Disc	Alloy nitriding steel, nitriding stainless steel, wear-resistant steel
valve seat	Alloy nitriding steel, nitriding stainless steel, wear-resistant steel
Bearing	Aluminum bronze, Fz-1 composite
	Polytetrafluoroethylene, flexible graphite

Q347 Connecting dimensions of external structure of manual eccentric hemisphere valve PN16 ～ PN25

Nominal pressure PN/Mpa	Nominal diameter DN/mm	size （mm）
		L	D	K	d	f	C	Z-￠d	H
1.6	40	165	150	110	85	3	16	4-￠18
	50	178	165	125	100
	65	190	185	145	120		18		280
	80	203	200	160	135		20	8-￠18	320
	100	229	220	180	155				370
	125	254	250	210	185		22		430
	150	267	285	240	210		24	8-￠23	510
	200	292	340	295	265		26	12￠-23	600
	250	330	405	355	320		30	12-￠26	690
	300	502	460	410	375	4			760
	350	572	520	470	435		34	16-￠26	830
	400	610	580	525	485		36	16-￠30	925
	450	660	640	585	545		40	20-￠30	1025
	500	700	715	650	608		44	20-￠34	1120
	600	813	840	770	718	5	48	20-￠36	1210

 

1. Be careful in installation and construction, and do not hit the valve.
2. Before installation, the ball valve should be inspected to check the specification and model, and identify whether there is damage, especially for the valve stem. Turn it a few times to see if it is skewed, because Zui is prone to bump the stem during transportation. Also remove the debris in the valve.
3. When lifting the ball valve, the rope should not be tied to the hand wheel or the valve stem to avoid damage to these parts, but should be tied to the valve body.
4. The pipeline connected to the ball valve must be cleaned. Compressed air can be used to blow away iron oxide chips, mud and sand, welding slag and other impurities. These debris, not only easy to scratch the sealing surface of the ball valve, in which large particles of debris (such as welding slag), but also block the small valve, so that its failure.
5. The position of valve handle rotation should be reserved during installation. 6. The ball valve cannot be used as throttling. 7. The ball valve with transmission mechanism shall be installed vertically.