Description

D371X Worm Gear Soft-Seated Wafer Butterfly Valve

The D371X worm gear soft-seated wafer butterfly valve consists of a rubber-lined
valve body, carbon steel or stainless steel butterfly disc and valve shaft. It
is designed for flow regulation and shut-off in water, air, natural gas, oil
products and mildly corrosive fluid pipelines.

The valve is widely used in water treatment plants, power plants, steel mills,
chemical plants, petroleum systems, food processing, textile mills, paper mills
and other industrial water supply and drainage systems. Its compact wafer
construction and worm gear operation make it suitable for applications requiring
reliable sealing and convenient manual control.

Main Features

Innovative and compact wafer-type design.
Lightweight construction with fast opening and closing.
Low operating torque and convenient worm gear operation.
Can be installed in any position.
Replaceable sealing seat for convenient maintenance.
Reliable bidirectional sealing with zero visible leakage under suitable conditions.
Rubber sealing materials provide resistance to ageing and mild corrosion.
Suitable for water, air, natural gas, oil and mildly corrosive fluids.
Carbon steel or stainless steel disc and shaft options.

Technical Specifications

Item	Specification
Model	D371X
Product Type	Worm gear soft-seated wafer butterfly valve
Nominal Size	DN50 to DN2000
Pressure Rating	PN0.6, PN1.0 and PN1.6 MPa
Sealing Test Pressure	0.66, 1.10 and 1.76 MPa
Shell Test Pressure	0.90, 1.50 and 2.40 MPa
Seat Materials	Nitrile rubber or fluororubber
Temperature Range	Nitrile rubber: -40°C to +90°C; fluororubber: -20°C to +200°C
Applicable Media	Water, air, natural gas, oil products and mildly corrosive fluids
Leakage Standard	GB/T 13927-1992
Operation	Worm gear, electric, pneumatic or hydraulic actuator

Main Materials

Part	Material
Valve Body	WCB, QT450-10, HT200 or HT250
Butterfly Disc	WCB, QT450-10, HT200 or HT250
Valve Shaft	2Cr13 stainless steel
Sealing Ring	Oil-resistant nitrile rubber
Packing	Flexible graphite

Applicable Standards

Item	Standard
Design and Manufacture	GB/T 12238-1989
Flange Dimensions	GB 9113-2000 and GB/T 17241.6-1998
Face-to-Face Dimensions	GB/T 12221-1989
Inspection and Testing	GB/T 13927-1992

Main Dimensions — D371X PN6 / PN10 / PN16

DN	L	H	H0	A	B	PN6		PN10		PN16
DN	L	H	H0	A	B	D0	n-d	D0	n-d	D0	n-d
50	43	63	306	180	200	110	4-14	125	4-18	125	4-18
65	46	70	321	180	200	130	4-14	145	4-18	145	4-18
80	46	83	346	180	200	150	4-18	160	8-18	160	8-18
100	52	105	387	180	200	170	4-18	180	8-18	180	8-18
125	56	115	411	180	200	200	8-18	210	8-18	210	8-18
150	56	137	447	270	280	225	8-18	240	8-22	240	8-22
200	60	164	572	270	280	280	8-18	295	8-22	295	8-22
250	68	206	646	270	280	335	12-18	350	12-22	355	12-26
300	78	230	738	380	420	395	12-22	400	12-22	410	12-26
350	78	248	761	380	420	445	12-22	460	16-22	470	16-26
400	102	289	877	450	470	495	16-22	515	16-26	525	16-30
450	114	320	938	480	490	550	16-22	565	20-26	585	20-30
500	127	343	993	480	490	600	20-22	620	20-26	650	20-33
600	154	413	1131	480	490	705	20-26	725	20-30	770	20-36
700	165	478	1476	640	660	810	24-26	840	24-30	840	24-36
800	190	525	1533	640	660	920	24-30	950	24-33	950	24-39
900	203	585	1655	750	860	1020	24-30	1050	28-33	1050	38-39
1000	216	640	1765	850	900	1120	28-30	1160	28-36	1170	28-42
1200	254	755	1995	850	900	1340	32-33	1380	32-39	1390	32-48

Typical Applications

Water treatment plants
Power plants
Steel mills
Chemical processing plants
Petroleum and gas pipelines
Food and beverage systems
Textile and paper mills
Industrial water supply and drainage systems

Dimensions, materials, seat configuration and pressure-temperature limits are subject to the final WDL Valve technical drawing and approved project datasheet.

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D371X Worm Gear Soft-Seated Wafer Butterfly Valve

Description