Bellows Gate Valve

Product overview

Gate valve with bellow seal acc. To GB is applicable to the cutting and connection of pipelines medium that are used in various industries such as petroleum, chemical industry, pharmacy, chemical fertilizer, electric power industry etc under nominal pressure of PN1.6 to 16MPa and working temperature of −29~350℃.

Product Features

This product has logical structure, reliable seal, excellent performance and nice design.
The seal surface is build-up welding with Co hard alloy, which is attrition-resistant, corrosion-resistant, has good friction resistant and long life.
The stem is quenched and tempered, and its surface is treated by nit riding treatment, thus it has good corrosion resistant and friction resistant.
It has double seal capability, thus is more reliable.
The stem may show the position of lift, thus it is clearer.
The part material, flange and butt weld end dimension may be selected according to current operating condition and users’ requirement, so that meet the requirements of various engineering.

Technical Specification

Structural Formation	Driving Manner	Design Standard	Face to Face	Flange Ends	Test & Inspection
BB-BG-OS & Y	Hand-operated / Electric-actuated	GB12234	GB12221	GB9113; JB79; HG20596	JB/T 9092; GB/T 13927

Products Performance Specification

Nominal Pressure (MPa)	Shell Test (MPa)	Sealing Test (MPa)	Suitable Temp. (°C)	Suitable Medium
1.6	2.4	1.76	≤350°C	Water, oil & gas
2.5	3.75	2.75	≤350°C	Water, oil & gas
4.0	6.0	4.4	≤350°C	Water, oil & gas
6.4	9.6	7.04	≤350°C	Water, oil & gas

Main Parts and Materials

No.	Part Name	Material
1	Body	WCB, CF8, CF8M, CF3, CF3M
2	Disc	25, 1Cr13, 2Cr13, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, 20Cr1Mo1V, 25Cr2MoV
3	Stem	25, 1Cr13, 2Cr13, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, 20Cr1Mo1V, 25Cr2MoV
4	Bellow Assembly	1Cr18Ni9Ti, 304, 316, 304L, 316L
5	Yoke	WCB, CF8, CF8M, CF3, CF3M
6	Gasket	Flexible graphite + stainless steel, PTFE
7	Bonnet	WCB, CF8, CF8M, CF3, CF3M
8	Nut	0Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, 35CrMoV, 25Cr2MoV
9	Bolt	0Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, 35CrMoV, 25Cr2MoV
10	Packing	Flexible graphite, PTFE
11	Gland	WCB, CF8, CF8M, CF3, CF3M
12	Yoke Nut	ZQA19-4 Copper Alloy
13	Handwheel	WCB QT400-18

Bellows Gate Valve

Main Dimension

Type: WZ41H-16C WZ41W-16P WZ41Y-16R

DN	L	D	D1	D2	D6	b	N-Φd	H	D0	L2	H1	DA	Electric Actuator Code
15	130	95	95	45	-	14	4-Φ14	190	120	-	-	-	-
20	150	105	75	55	-	14	4-Φ14	195	140	-	-	-	-
25	160	115	85	65	-	14	4-Φ14	225	140	-	-	-	-
32	180	135	100	78	-	16	4-Φ18	260	180	-	-	-	-
40	200	145	110	85	-	16	4-Φ18	280	200	590	595	365	DZW10
50	250	160	125	100	-	16	4-Φ18	360	220	590	653	365	DZW10
65	265	180	145	120	-	18	4-Φ18	375	260	590	665	365	DZW10
80	280	195	160	135	-	20	8-Φ18	435	280	590	725	365	DZW10
100	300	215	180	155	-	20	8-Φ18	500	300	590	787	365	DZW15
125	325	245	210	185	-	22	8-Φ18	615	340	590	934	365	DZW20
150	350	280	240	210	-	24	8-Φ23	675	400	590	955	365	DZW20
200	400	335	295	265	-	26	12-Φ23	815	450	590	1105	365	DZW20
250	450	405	355	320	-	30	12-Φ25	965	450	810	1343	470	DZW30
300	500	460	410	375	-	30	12-Φ25	1145	500	810	1516	470	DZW30
350	550	520	470	435	-	34	16-Φ25	1280	500	810	1678	470	DZW45
400	600	580	525	485	-	36	16-Φ25	1450	560	830	1849	550	DZW90
450	650	640	585	545	-	40	20-Φ30	1540	600	830	1937	550	DZW120
500	700	705	650	608	-	44	20-Φ34	1675	640	830	2234	550	DZW120
600	800	840	770	718	-	48	20-Φ41	1875	720	870	2432	320	DZW180
700	900	910	840	788	-	50	24-Φ41	2085	800	870	2489	320	DZW250
800	1000	1020	950	898	-	52	24-Φ41	2400	950	1170	2643	570	DZW250

Type: WZ41H-25C WZ41W-25P WZ41Y-25R

DN	L	D	D1	D2	D6	b	N-Φd	H	D0	L2	H1	DA	Electric Actuator Code
15	130	95	65	45	-	16	4-Φ14	190	120	-	-	-	-
20	150	105	75	55	-	16	4-Φ14	195	140	-	-	-	-
25	160	115	85	65	-	16	4-Φ14	225	140	-	-	-	-
32	180	135	100	78	-	18	4-Φ18	260	180	-	-	-	-
40	200	145	110	85	-	18	4-Φ18	280	200	590	595	365	DZW10
50	250	160	125	100	-	20	4-Φ18	360	220	590	653	365	DZW10
65	265	180	145	120	-	22	8-Φ18	375	260	590	665	365	DZW10
80	280	195	160	135	-	22	8-Φ18	435	280	590	725	365	DZW15
100	300	230	190	160	-	24	8-Φ23	500	300	590	787	365	DZW20
125	325	270	220	188	-	28	8-Φ25	615	340	590	902	365	DZW20
150	350	300	250	218	-	30	8-Φ25	675	400	590	955	365	DZW20
200	400	360	310	278	-	34	12-Φ25	815	450	810	1105	470	DZW30
250	450	425	370	332	-	36	12-Φ30	965	450	810	1343	470	DZW30
300	500	485	430	390	-	40	16-Φ30	1145	500	810	1516	470	DZW60
350	550	550	490	448	-	44	16-Φ34	1280	500	830	1678	550	DZW90
400	600	610	550	505	-	48	16-Φ34	1450	560	830	1849	550	DZW120
450	650	660	600	555	-	50	20-Φ34	1540	600	830	1937	550	DZW120
500	700	730	660	610	-	52	20-Φ41/36	1675	640	870	2234	320	DZW180
600	800	840	770	718	-	56	20-Φ41	1875	720	870	2432	320	DZW250
700	900	955	875	815	-	60	24-Φ48/42	2085	800	870	2489	320	DZW500
800	1000	1070	990	930	-	64	24-Φ48	2400	950	1170	2643	570	DZW500

Type: WZ41H-40C WZ41W-40P WZ41Y-40R

DN	L	D	D1	D2	D6	b	N-Φd	H	D0	L2	H1	DA	Electric Actuator Code
15	130	95	65	45	-	16	4-Φ14	190	120	-	-	-	-
20	150	105	75	55	-	16	4-Φ14	195	140	-	-	-	-
25	160	115	85	65	-	16	4-Φ14	225	140	-	-	-	-
32	180	135	100	78	-	18	4-Φ18	270	180	-	-	-	-
40	200	145	110	85	-	18	4-Φ18	320	220	590	630	365	DZW10
50	250	160	125	100	-	20	4-Φ18	370	240	590	691	365	DZW10
65	280	180	145	120	-	22	8-Φ18	395	280	590	711	365	DZW10
80	310	195	160	135	-	22	8-Φ18	455	300	590	775	365	DZW15
100	350	230	190	160	-	24	8-Φ23	550	320	590	871	365	DZW20
125	400	270	220	188	-	28	8-Φ25	635	350	590	948	365	DZW20
150	450	300	250	218	-	30	8-Φ25	705	400	810	1028	470	DZW30
200	550	375	320	282	-	38	12-Φ30	860	450	810	1325	470	DZW30
250	650	445	385	345	-	42	12-Φ34	1015	560	810	1400	470	DZW45
300	750	510	450	408	-	46	16-Φ34	1200	640	830	1653	550	DZW60
350	850	570	510	465	-	52	16-Φ34	1340	640	830	1791	550	DZW90
400	950	655	585	535	-	58	16-Φ41	1495	720	870	2092	320	DZW120
450	1050	680	610	560	-	60	20-Φ41	1580	800	-	-	-	-
500	1150	755	670	612	-	62	20-Φ48/42	1700	950	870	2465	320	DZW250
600	1350	890	795	730	-	62	20-Φ54/48	1950	950	1170	-	570	DZW350
700	1450	995	900	835	-	68	24-Φ54/48	2250	1000	1170	-	570	DZW500
800	1650	1135	1030	960	-	76	24-Φ58	2480	1100	1060	-	500	DZW800

Manufacturing Process

Step 1: Order and Design

Based on the customer’s specifications for pressure rating, nominal diameter, material, and connection type, the structural design of the bellows gate valve is determined. Drawings, bills of materials, and manufacturing processes are finalized to ensure the product complies with relevant standards such as DIN, ANSI, or GB.

Bellows Gate Valve

Step 2: Forging & Casting

Major pressure-bearing components, such as the valve body and bonnet, are formed using forging or casting processes to ensure the bellows gate valve possesses excellent strength and sealing reliability. Upon arrival, raw materials undergo material testing, and blanks are subjected to initial inspections for appearance and dimensions.

Bellows Gate Valve

Step 3: Machining

Precision machining is performed on the valve body, bonnet, gate, stem, and sealing surfaces. Key machining areas for the bellows gate valve include the sealing surfaces, stem threads, flange faces, and bellows connection points to ensure assembly accuracy and operational stability.

Bellows Gate Valve

Step 4: Assembly

Machined components undergo cleaning and deburring before proceeding to the assembly process. During assembly, the focus is on installing the bellows assembly, valve stem, gate, and seals to ensure the bellows gate valve possesses excellent double-seal performance and smooth opening and closing.

Bellows Gate Valve

Step 5: Testing & Quality Assurance

After assembly, the bellows gate valve undergoes shell strength testing, seal testing, back-seal testing, and bellows leakage detection. Simultaneously, dimensional re-inspection, visual inspection, and opening/closing torque testing are conducted to ensure the product meets quality standards.

Bellows Gate Valve

Step 6: Painting and Finishing

After passing inspection, the valve surface undergoes rust removal, painting, and marking. Finally, the nameplate is installed, and the valve is packaged and subjected to a pre-shipment inspection. This ensures the product has a clean appearance, excellent corrosion resistance, and meets the requirements for transportation and on-site use.

Bellows Gate Valve

Applications

This valve is widely used in the petrochemical, power generation, pharmaceutical and food, natural gas, vacuum systems, and environmental protection and metallurgy industries. It is particularly suitable for applications involving the conveyance of high-temperature, high-pressure, flammable, explosive, toxic, or corrosive media, as well as those requiring high purity. Its key advantage lies in its bellows-sealed design, which effectively prevents media leakage along the valve stem. This not only enhances the safety and reliability of system operation but also helps reduce environmental pollution and energy waste.

These valves are widely used in:

Oil and Gas

Chemical Processing

Power Plants

Water Treatment

Metallurgy and Mining

Agriculture and Irrigation

Factory Environment

Factory Production Line

Material Storage

Quality Control

Assembly Workshop

Quality Control

Assembly Workshop

Why Choose Us

Superior Quality

Our valves are manufactured using premium materials and undergo rigorous quality testing to ensure reliable performance in demanding industrial applications.

Advanced Technology

Equipped with state-of-the-art CNC machining centers and precision manufacturing equipment, we deliver valves with exceptional accuracy and consistency.

Competitive Pricing

Through optimized manufacturing processes and bulk material procurement, we offer high-quality valves at competitive prices without compromising on quality.

Expert Support

Our experienced technical team provides comprehensive support from product selection to after-sales service, ensuring optimal valve performance for your specific application.

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