Pneumatic two-seat control valve

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Pneumatic two-seat control valve

Model: ZJHN
Nominal diameter: DN25 ~ 400mm
Nominal pressure: PN16 ~ 64MPa
Temperature: -250 ℃ ~ + 560 ℃
Main material: HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti
Medium gas, liquid, vapor, etc.: Medium
Drive mode: pneumatic
Design criteria: GB / T17213
Flange standard: GB / T9113, JB / T79 , HG20594 and other standard
Inspection standards: GB / T4213
Form connect: flange (FF RF RTJ), welding (SW BW), thread ( Suitable for 1 "or less

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产品详细

First, the pneumatic two-seat control valve overview

ZJHN pneumatic two-seat control valve with double-guided structure, equipped with multi-spring recruit agencies. Has the advantages of compact structure, light weight, action sensitive, large valve capacity, accurate flow characteristics, easy disassembly. Pneumatic two-seat control valve is widely used in precise control of gas, liquid, steam and other media process parameters such as pressure, flow, temperature, liquid level at a given value. Particularly suitable for large pressure drop, allowing greater leakage and not very clean media occasions.

Pneumatic two-seat control valve products are standard, bellows sealed, jacket insulation and other varieties. Product nominal pressure rating PN16, 40, 64; body diameter range DN25 ~ 400. Applicable fluid temperature -250 ℃ ~ + 560 ℃ range of a variety of grades. Leakage standards for grade Ⅲ and Ⅳ. Flow characteristics are linear or percentage. A wide variety of specifications to choose from.

Second, pneumatic two-seat control valve main parts and materials

Part Name	material	temperature range
Body valve cover	HT200	-20 ~ 200 ℃
	ZG230-450	-40 ~ 450 ℃
	ZG1Cr18Ni9Ti	-250 ~ 550 ℃
	ZG0Cr18Ni12Mo2Ti	-250 ~ 550 ℃
Spool, seat	1Cr18Ni9	-250 ~ 550 ℃
Spool, seat	0Cr18Ni12Mo2Ti	-250 ~ 550 ℃
filler	Teflon	-40 ~ 200 ℃
Diaphragm	NBR rubber reinforced polyester fabrics
compressed spring	60Si2Mn
Membrane cover	A3

Third, pneumatic two-seat control valve main technical parameters

Nominal diameter mm			25	32	40	50	65	80	100	125	150	200	250	300	400
Rated flow coefficient kv			10	16	25	40	63	100	250	250	400	630	100	1600	2700
Nominal pressure MPa			1.6 4.0 6.4
Travel mm			16		25		40			63			100
Medium temperature ℃			-40 ~ 230 ℃ (room temperature type), heat sink 230 ~ 450 ℃ (medium temperature), special order -100 ~ 600 ℃
Flow characteristics			Straight line, equal percentage
Flange standard			In line with JB78-59, JB79-59 standards, according to JB / 79.1-94, JB / 79.2-94, ANSI, JIS, DIN and other standard production orders
Body material	PN (MPa)	1.6	WCB (ZG230-450) CF3CF8 CF8M
		4.0,6.0	WCB (ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti CF8 CF8M
Spool material			1Cr18Ni9,0Cr18Ni12Mo2Ti CF8 CF8M
On the bonnet type			Ordinary type (normal temperature type), hot type (medium temperature type)
Adjustable ratio			30: 1
Air source connector			M16 × 1.5

Fourth, pneumatic two-seat control valve pneumatic actuator

model	ZHA (B) -1	ZHA (B) -2	ZHA (B) -3	ZHA (B) -4	ZHA (B) -5	ZHA (B) -6
Effective area of cm2	200	280	400	630	1000	1600
Travel mm	10	16	25	40	60	1000
Spring range KPa	20 to 100 (standard); 20 to 100, 40 to 200, 20 to 60, 60 to 100, 80 to 240

Fifth, pneumatic two-seat control valve pneumatic actuator main technical performance indicators

project		Index value
Basic error%	Without locator	± 5.0
Basic error%	With locator	± 1.0
Backlash%	Without locator	3.0
Backlash%	With locator	1.0
dead zone%	Without locator	3.0
dead zone%	With locator	0.4
Permissible leakage L / h		1 × 10-3 × valve rated capacity

Sixth, pneumatic two-seat control valve actuator allows pressure

Supply pressure MPa	Spring pressure KPa	Nominal diameter
Supply pressure MPa	Spring pressure KPa	25	32	40	50	65	80	100	125	150	200	250	300
0.14	20-100	5.4	4.4	4.9	3.8	4.7	3.6	2.8	3.75	2.7	2.15	2.0	1.7
0.24	40-200	10.8	8.8	9.8	7.6	9.4	7.2	5.6	7.5	5.4	4.3	4.0	3.4

Note: The condition of use is P2 = 0 when the stem is out of the media outlet.

Seven, pneumatic two-seat control valve dimensions

Public Path (mm)		25	32	40	50	65	80	100	125	150	200	250	300
L (mm)	PN1.6MPa	185	200	220	250	275	300	350	410	450	550	670	770
	PN4.0MPa	190	210	230	255	285	310	335	425	460	560	740	805
	PN6.4MPa	200	210	235	265	295	320	370	440	475	570	750	820
H (mm)	normal type	567	570	645	650	877	887	899	1058	1068	1110	1498	1574
H (mm)	Heat sink type	697	700	775	780	1040	1050	1062	1257	1267	1309	1743	1819
H1 (mm)		117	120	139	144	188	208	220	268	278	320	441	503
D (mm)		225				360			470			620
Weight (KG)		33	35	47	51	98	111	148	236	292	433	760	920

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