First, product overview：

　　The working principle of the upper and lower expansion discharge valve: the principle of the valve stem to push the disc up and down, so as to achieve the purpose of opening and closing. When the hand wheel turns along, the stem goes up and the valve closes. When the hand wheel reverses, the stem drops and the valve closes. The upspread type is used for discharge of the reaction kettle with agitator (except frame anchor type); The downward expansion type and the plunger type are used for the reaction kettle discharge of the frame anchor agitator. The sealing surface is made of scour and corrosion-resistant materials, and is specially treated to make the surface hardness reach HRC48 ~ 52. It has the function of high wear resistance and corrosion resistance, which ensures the sealing reliability of the valve. Widely used in chemical, petroleum, metallurgy, pharmaceutical, dye, food processing and other industries.

Second, the difference between the upper and lower opening type discharging valve:

The upspread discharging valve is the rising valve disc. When the valve is opened, the spool extends into the reaction pot, which can play the role of ejector, so that the material is discharged dynamically. The discharging effect is good and the bottom of the pot does not accumulate material, which is an ideal discharging valve. The spool is designed to be movable to prevent stuttering. The disc adopts a conical sealing surface and the seat adopts a very small circular sealing surface. In this way, the disc and seat close together to form a similar line seal form, sealing effect is excellent.


The principle of the downward expansion discharge valve is the valve flap of the downward working mode, which eliminates the residual phenomenon of the medium at the bottom of the container. It is mainly installed in the reaction pot with slurry, turbine or propulsion agitator. When the valve is opened, the spool cannot be extended into the reaction pot, so that the material can be discharged dynamically. The feeding effect is good and the bottom of the pot does not accumulate material, which is a relatively ideal feeding valve.

Third, the upper/lower expansion type discharge valve product features:

1, the valve body cavity is equipped with anti-erosion, anti-corrosion sealing ring.


2, 2, sealing surface using line sealing, to ensure the reliability of sealing, and can prevent scarring.


3, 3, valve disc seal according to the need of the cover are welded with hard alloy, with high wear resistance, corrosion resistance.


4, 4, various modes of operation, such as manual, pneumatic (spring return type, double acting type, with and without hand wheel), electric, hydraulic, gear, etc.


Valve pneumatic device: valve pneumatic drive device is safe, reliable, low cost, easy to use and maintenance, is a large branch of the valve drive mechanism. The working pressure used in pneumatic technology is low, usually greater than 0.82MPa, and because the structure size should not be too large, the total thrust of pneumatic device cannot be large.

Fourth, the use of pneumatic device conditions:

Air source working pressure	0.4～0.7MPa
Ambient temperature and medium temperature	5～60℃
Electromagnetic control signal current	4～20mA

Product name：	Pneumatic up/down expansion discharge valve	Applicable medium：	Granular materials, crystalline particles, other materials, etc
Nominal diameter：	DN25～DN250	Structural form：	Up-spread and down-spread
Nominal pressure：	1.6MPa～2.5MPa～4.0MPa	Connection mode：	flange
Applicable temperature：	-29ºC～+425ºC	Driving mode：	Manual, pneumatic, electric
Valve body material：	Cast steel, stainless steel	Manufacturing standard：	GB, German DIN, American API, ANSI

　　

Standard specification


1. Design and manufacturing standard according to GB/T12235-2007


2. The standard of structure length is according to the enterprise standard


3. Flange connection according to JB/T79-94, GB/T9113 HG20592-2009, etc


4. Test and inspection according to GB/T13927-2008

　 Material of main parts

Part name	ZG1Cr18Ni9Ti series	ZG00Cr18Ni10 series	ZG1Cr18Ni12MO 2 Ti series	ZG00Cr17Ni14MO 2 series	WCB series
Body/bonnet	ZG1Cr18Ni9Ti	ZG00Cr18Ni10	ZG1Cr18Ni12MO 2 Ti	ZG00Cr17Ni14MO 2	WCB
Valve stem	ZG1Cr18Ni9Ti	ZG00Cr18Ni10	ZG1Cr18Ni12MO 2 Ti	ZG00Cr17Ni14MO 2	WCB
disc	ZG1Cr18Ni9Ti	ZG00Cr18Ni10	ZG1Cr18Ni12MO 2 Ti	ZG00Cr17Ni14MO 2	WCB
gasket	304+PTFE	304L+PTFE	316+PTFE	316L+PTFE	graphite+304
stud	1Cr17Ni2	1Cr17Ni2	1Cr17Ni2	1Cr17Ni2	35CrMoA
nut	1Cr18Ni9Ti	1Cr18Ni9Ti	1Cr18Ni9Ti	1Cr18Ni9Ti	45

Outline structure drawing

Main dimensions (upspread)

DN	d	D	D1	D2	D3	D4	D5	D6
25	25	115	85	65	115	85	60	40
32	32	135	100	78	135	100	65	45
40	40	145	110	85	145	110	80	60
50	50	160	125	100	160	125	85	70
65	65	180	145	120	180	145	125	85
80	80	195	160	135	195	160	135	95
100	100	215	180	155	215	180	160	130
125	125	245	210	185	245	210	180	140
150	150	280	240	210	280	240	185	165
200	200	335	295	265	335	295	255	230
250	250	405	355	320	460	410	350	240

Main dimensions (bottom spread)

DN	d	D	D1	D2	D3	D4	D5	D6
25	25	115	85	65	135	100	75	55
32	32	135	100	78	145	110	80	57
40	40	145	110	85	160	125	100	65
50	50	160	125	100	180	145	125	70
65	65	180	145	120	195	160	135	90
80	80	195	160	135	215	180	155	130
100	100	215	180	155	245	210	195	135
125	125	245	210	185	280	240	180	145
150	150	280	240	210	335	295	215	185
200	200	335	295	265	405	355	300	220
250	250	405	355	320	460	410	350	240