D643h Pneumatic Hard Seal Butterfly Valve

• Media: Water Vapor Oils
• Driving Mode: Electromanual Pneumatic
• Connection Form: Flange Welding
• Structure: Three-Eccentric Sealing
• Seal Form: Supercharging Pressured Sealed
• Valve Stem: Normal
• Model NO.: D643H
• Work Pressure: Mid-Pressure (2.5mpa< Pn <6.4mpa)
• Working Temperature: Medium Temperature (120°C<T<450°C)
• Material of Seal Surface: Metal Hard Sealed
• Valve Body: Sheet Metal
• Standard: National Standard
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Transport Package: Wooden Box
• Specification: DN50-DN2400
• Trademark: xc
• Origin: China
• HS Code: 8481804090
• Production Capacity: 10000

Product Description

First, pneumatic hard seal butterfly valve product overview

The pneumatic hard seal butterfly valve structure of Xuan Cheng company is composed of quality pneumatic actuators and three-dimensional core hard seal butterfly valves, which can also be called pneumatic three-eccentric butterfly valves. The valve seat adopts the multi-level structure of hard seal compatibility, exquisite processing and advanced technology. Pneumatic metal seal butterfly valve and electrical valve positioner supporting, input 4 ~ 20mADC signal and 0.4 ~ 0.7MPa air source can control the operation, can achieve the pressure, flow, temperature, liquid level and other parameters of the adjustment. Pneumatic hard seal butterfly valve with travel limit switch, solenoid valve, pressure reducing valve and 0.4-0.7MPa air source can realize switching operation, and send two pairs of passive contact signal indicating the switch of the valve. Pneumatic hard seal butterfly valve is composed of valve body, butterfly plate, multi-level valve seat, stem, transmission mechanism and other main components, simple structure, small size, light weight, so pneumatic metal seal butterfly valve is widely used in metallurgy, electric power, petroleum, chemical industry, air, gas, combustible gas and water supply and drainage and other corrosive media pipelines.

Second, pneumatic hard seal butterfly valve product characteristics

(1) The pneumatic metal seal butterfly valve adopts a three-eccentric sealing structure, the seat and the butterfly plate are almost no wear, and the sealing function is more and more tight.
(2) The sealing ring is made of stainless steel, with the double advantages of metal hard seal and elastic seal, regardless of low temperature and high temperature, it has excellent sealing performance, corrosion resistance, long service life and other characteristics.
(3) The sealing surface of the butterfly plate is surfacing cobalt-based cemented carbide, which is wear-resistant and has a long service life.
(4) Large specifications of the butterfly plate quilted structure, high strength, large flow area, small flow resistance.
(5) The pneumatic three-eccentric butterfly valve has a bi-directional sealing function, which is not limited by the flow direction of the medium during installation and is not affected by the spatial position, and can be installed in any direction.
(6) The pneumatic device can be installed in multiple stations (rotation 90° or 180°), which is easy for users to use.

Three, the main design standards of pneumatic hard seal butterfly valve

Design standard	GB/T12238-1989
Flange connection dimensions	GB/T9113.1-2000; GB/T9115.1-2000; JB78
Structural length	GB/T12221-1989
Pressure test	GB/T13927-2000; JB/T9092-1999

Four, pneumatic hard seal butterfly valve actuator technical parameters

Nominal diameter DN(mm)	DN50 to 1000mm	Actuator type number	GT, AT, AW series single and double acting pneumatic actuator
Nominal pressure (MPa)	PN1.0, 1.6, 2.5MPa	Air supply pressure	0.4 to 0.7MPa
Body form	Straight through casting body	Air source connector	G1/4", G1/8", G3/8", G1/2"
Connection form	Flange type, sandwich type	Ambient temperature	-30 to +70 ° C
Spool form	Butterfly plate	Mode of action	Single acting actuator, double acting actuator
Sealing packing	Flexible graphite, tef-lon	Accessories available	Positioner, solenoid valve, air filter pressure reducer, holding valve, stroke switch, valve position transmitter, handwheel mechanism, etc
Flow characteristics	Approximate equal percentage, straightness	Using a new type of pneumatic actuator, double acting and single acting (spring return), rack and pinion drive, safe and reliable; Large diameter valve adopts series AW type pneumatic actuator fork type transmission, reasonable structure, large output force, double acting and single acting. 1, gear type double piston, output torque is large, small volume. 2, cylinder selection of aluminum gold material, light weight, beautiful appearance. 3. Manual operation mechanism can be installed at the top and bottom. 4, rack type connection can adjust the opening Angle, rated flow. 5, the actuator can choose live signal feedback indication and accessories to achieve automatic operation. 6. IS05211 standard connection provides convenience for the installation and replacement of the product. 7, both ends of the adjustable screw can make the standard product in 0° and 90° have a ±4° adjustable range. Ensure the synchronization accuracy with the valve.
Range of action	0 to 90°
Leakage Q	Meets ANSI B16.104 Level IV standards
Applicable temperature	Hard seal ≤450ºC
Basic error	With positioner: less than ±2% of the full stroke
Return difference	With positioner: less than 2% of full trip
Adjustable range	50:1
Configuring the actuator	GT, AT, AW series single and double acting pneumatic actuators
Control mode	Switch two position control, 4-20mA analog control

Five, pneumatic hard seal butterfly valve main parts materials

Part name	Materials
Body	Cast iron, stainless steel, chrome-molybdenum steel, alloy steel
Butterfly plate	Cast steel, alloy steel, stainless steel, chrome-molybdenum steel
Sealing ring	Stainless steel combined with high temperature resistant asbestos sheet to form multiple layers
Valve stem	2Cr13, 1Cr13 stainless steel, chrome molybdenum steel
Stuffing	O-rings, flexible graphite

Six, pneumatic hard seal butterfly valve main performance specifications

Nominal diameter DN(mm)		DN50 to 1200
Nominal pressure	PN(MPa)	0.6	1.0	1.6	2.5
Test pressure	Strength test	0.9	1.5	2.4	3.75
	Seal test	0.66	1.1	1.76	2.75
	Low pressure airtight test	0.5 to 0.7
Applicable media	Air, water, sewage, steam, gas, oil, etc
Applicable temperature	Carbon steel: -29ºC ~ 600ºC Stainless steel: -40ºC ~ 600ºC

Seven, pneumatic hard seal butterfly valve three-eccentric sealing structure principle

(1) deviate from the center of the pipeline
(2) deviate from the center of the sealing surface
(3) inclined cone
when the valve is opened, the butterfly plate and the valve seat are in instant contact when closed, and the butterfly plate eccentric 1 and eccentric 2 are quickly removed from the valve seat, reducing the wear of the sealing pair, the friction torque is small, and the opening is flexible. Eccentric cone 3, so that when the valve is opened or closed, the butterfly plate can pass through the valve seat hole to achieve contact sealing. In addition, the rotation radius of the conical butterfly plate is greater than the rotation radius of the contact position of the sealing pair, so the butterfly plate will be more and more tightly closed when the valve is closed, which can realize self-locking and prevent the butterfly plate from overpositioning.

Eight, pneumatic hard seal butterfly valve installation and connection size

Nominal pass through (DN)	Primary dimensions					Flange dimensions
	L	L1	H	H1	A	1.0 MPa			1.6 MPa			2.5 MPa
						D	D1	N - Ф d	D	D1	N - Ф d	D	D1	N - Ф d
50	108	43	112	625	245	165	125	4 to 18	165	125	4 to 18	165	125	4 to 18
65	112	46	115	625	245	185	145	4 to 18	185	145	4 to 18	185	145	8 to 18
80	114	46	120	645	245	200	160	4 to 18	200	160	8 to 18	200	160	8 to 18
100	127	52	138	675	355	220	180	8 to 18	220	180	8 to 18	235	190	8-22
125	140	56	164	715	355	250	210	8 to 18	250	210	8 to 18	270	220	8-26
150	140	56	175	800	355	285	240	8-22	285	240	8-22	300	250	8-26
200	152	60	200	850	250	340	295	8-22	340	295	12 and 22	360	310	12-26
250	165	68	243	925	250	395	350	12 and 22	405	355	12-26	425	370	12-30
300	178	78	250	1035	450	445	400	12 and 22	460	410	12-26	485	430	16 and 30
350	190	78	280	1070	450	505	460	16-22	520	470	12-26	555	490	16-33
400	216	102	305	1190	450	565	515	16 and 26	580	525	16 and 26	620	550	16-36
450	222	114	350	1250	650	615	565	20 to 26	640	585	16 and 30	670	600	20-36
500	229	127	380	1290	650	670	620	20 to 26	715	650	20-30	730	660	20-36
600	267	154	445	1455	850	780	725	20-30	840	770	20-33	845	770	20 to 39
seven hundred	292	165	480	1585	850	895	840	24 to 30	910	840	24-36	960	875	24-42
800	318	190	530	1700	1250	1015	950	24 to 33	1025	950	24-39	1085	990	24-48
900	330	203	580	1965	1250	1115	1050	28 and 33,	1125	1050	28-39	1185	1090	28 and 48
1000	410	216	650	2015	1250	1230	1160	28-36	1255	1170	28-42	1320	1210	28 and 56
1200	470	254	760	2250	1250	1455	1380	32-39	1485	1390	32-48	1530	1420	32-56

Nine, pneumatic hard seal butterfly valve product selection

(1) Valve body parameters: nominal diameter, working pressure, process medium, application occasions, valve body material and other parameters.
(2) Actuator parameters: actuator form, control mode, control signal (4-20mA,1-5V), mode of action (gas-open, gas-close)
as far as possible to provide the technical parameters of pneumatic hard seal butterfly valve in detail, to facilitate our company's production and technical personnel for your accurate selection. If you have any questions, you can call us, we will do our best to provide you with quality service!