Top 10 Flowserve Mechanical Seal Replacement Manufacturers in China

2026-06-09

Top 10 Flowserve Mechanical Seal Replacement Manufacturers in China | MIAOYU

Top 10 Flowserve Mechanical Seal Replacement Manufacturers in China

Flowserve (USA) is one of the world's leading sealing system providers, with a vast portfolio covering API 682 cartridge seals, metal bellows seals, elastomer bellows seals, and mixer seals.

In the aftermarket (MRO) sector, Chinese mechanical seal manufacturers have developed high-precision, dimensionally interchangeable replacements that meet or exceed OEM specifications at a fraction of the cost. Below is a comprehensive Flowserve seal series reference followed by the Top 10 Flowserve Mechanical Seal Replacement Manufacturers in China, featuring NINGBO MIAOYU MACHINERY TECHNOLOGY CO., LTD.

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Flowserve Mechanical Seal Series — Common Replacement Models & Applications

Chinese OEM suppliers typically produce direct-interchange replacements for the following Flowserve series:

Series Prefix	Typical Models	Main Characteristics & Applicable Conditions
ISC2 / ISC2-682	ISC2-1"-2", ISC2-682, ISC2-PX, ISC2-PP	Standard/cartridge pusher or metal bellows; API 682 Type A/B compliant; −40~204°C, ≤20.7 bar; general chemical process, refinery, water treatment
RO / CRO	RO-16, RO-19, RO-28, CRO-75	Single-coil spring PTFE wedge seal; ANSI/DIN process pumps; light corrosive liquids, water, solvents
Pac-Seal (Type 21 Equivalent)	Pac-Seal 21, Type 21 O-ring	Elastomer O-ring bellows; unbalanced single spring; general service water pumps, mild chemicals
U / D / UC Series	U-200, D-750, UC-600	Balanced pusher seal with large single coil spring; API 682 Type A; refinery, hydrocarbon service, high pressure
Allpac / Allpac 682	Allpac 682, Allpac-B	Balanced pusher or metal bellows; API 682 compliant; hot oil, refinery, high-temp process fluids
BXR / BXQ / BXRH	BXR-15, BXQ-25, BXRH	Stationary welded metal bellows; high temp (to 400°C+), thermal shock resistance; coker, hot oil, steam
SLC / SLM (SL-5000/6000)	SLC-200, SLM-3000	Heavy/medium-duty cartridge slurry seals; mining, paper, wastewater with abrasives
Mixerpac / ISC2-MW / ST	ISC2-MW, Mixerpac MP, ST	Mixer/top/bottom-entry agitator cartridge seals; pharmaceutical, biotech, chemical mixing vessels
Circpac / GLS / GSS / GSG	Circpac MD, GLS-500	Integral gear pump & compressor seals; OEM for screw/gear pumps
RIS / PL / RA	RIS-100, PL-200, RA (PTFE)	Non-metallic wetted parts / PTFE outer-mounted; strong acid/alkali (H₂SO₄, NaOH), FRP pumps

Top 10 Flowserve Mechanical Seal Replacement Manufacturers in China

NINGBO MIAOYU MACHINERY TECHNOLOGY CO., LTD.

Ningbo, Zhejiang Province

Specializes in OEM/ODM mechanical seals interchangeable with Flowserve (ISC2, RO, Pac-Seal Type 21), John Crane, Burgmann (MG1/MG12/M3N/H7N), AESSEAL, Grundfos, and Flygt.

Established: 2018 (industry experience since 2015)
Products: Offers cartridge seals, metal bellows (Type 606 eq.), O-ring & elastomer bellows seals, and full material options (SiC, TC, carbon graphite, Inconel bellows).
Certifications: ISO 9001 certified, exports to 50+ countries.

Guangzhou Lepu Machinery Co., Ltd. (Lepu Seal)

Guangzhou, Guangdong

One of China's most recognized cartridge seal makers since 1998. Produces Flowserve ISC2, RO, Pac-Seal equivalents plus John Crane & Burgmann interchanges.

Strengths: Strong R&D, large inventory, OEM/ODM customization. Widely used in petrochemical, water, and power industries.

Shanghai Trisun Parts Manufacture Co., Ltd.

Shanghai

Established 1998, ISO 9001 & TS16949. Manufactures industrial pump seals interchangeable with Flowserve, John Crane & Burgmann. Supplies OEM to domestic and international noted enterprises.

Focus: Water pump, industrial pump and auto cooling seals.

Anhui Hengda Mechanical Seal Manufacturing Co., Ltd. (Hengmi Seal)

Fuyang, Anhui Province

40+ series, 1,000+ sizes. Direct replacements for Flowserve cartridge/pusher/bellows seals, Grundfos, KSB, Alfa Laval, Chesterton. API 682–compliant options available.

Global Reach: Exports globally.

Sino-Holding Co., Ltd. (SH Seals)

Beijing (with 3 factories in China)

Since 1999, 200+ staff. Complete range of mechanical seals equivalent to Flowserve (ISC2, RO, U/D Series), John Crane, Burgmann, AESSEAL.

Specialization: Also specializes in Flygt, APV, Grundfos, Alfa Laval pump seals. OEM/ODM per drawing/sample.

Chengdu Fluidstar Machinery Co., Ltd.

Chengdu, Sichuan Province

Focuses on high-end replacement seals for international brands including Flowserve (metal bellows, cartridge seals), John Crane, Burgmann.

Markets: Active in oil & gas, refinery, and power generation sectors with API-plan compatible solutions.

Hangzhou Sealcon Fluid Machinery Co., Ltd.

Hangzhou, Zhejiang

Manufacturer & trader of mechanical seals and spares. Produces Flowserve-compatible cartridge seals, elastomer bellows, and metal bellows.

Services: Serves water treatment, chemical, and food & beverage industries with fast delivery.

Jiashan Yongbang Sealing Parts Co., Ltd.

Jiashan, Zhejiang

Extensive range of O-ring, PTFE wedge, single/double cartridge seals compatible with Flowserve RO/Type 21/ISC2 series.

Strengths: Strong in general industrial pump and water pump aftermarket.

Wenling Jindian Seals Factory

Wenling, Zhejiang

Long-standing pump seal maker producing Flowserve-compatible elastomer bellows and cartridge seals for water/light industrial applications.

Advantages: Competitive pricing, good for high-volume MRO buyers.

Zhaoqiang Seal (Zhejiang/Anhui-based operations)

Eastern China

Specialized in tailor-made mechanical seals for petroleum, petrochemical, steel, and chemical industries.

Products: Produces metal bellows and high-pressure pusher seals as Flowserve alternatives for refinery and high-temp applications.

MIAOYU Company Overview & Capabilities

As the #1 recommended manufacturer, we have the experience and capacity to meet your most demanding Flowserve replacement requirements.

5,000+

Manufacture base (㎡)

50+

Export Countries

OEM Experience (Year)

ISO 9001

Certified

Request OEM/ODM Customization

Why Choose Chinese Flowserve Replacement Seals?

Dimensional Interchangeability — Reverse-engineered to match OEM gland plate, sleeve, and face dimensions

Cost Savings — Typically 30%~60% lower than genuine Flowserve pricing

Material Flexibility — SiC/SiC, TC/Carbon, Hastelloy C-276 bellows, Viton/FFKM/PTFE elastomers

Fast Lead Time & MOQ — Suitable for both project bulk orders and urgent MRO spares

OEM/ODM Service — Customized to non-standard seal chambers or special API Plans

Note: For most general process pump applications, a Chinese-manufactured ISC2 or RO-series equivalent from reputable suppliers like Ningbo Miaoyu provides reliable, leak-free performance with significant lifecycle cost reduction.

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Frequently Asked Questions (FAQ)

Q: Are Chinese Flowserve replacements truly interchangeable with original seals?

A: Yes, reputable manufacturers like NINGBO MIAOYU produce seals to the exact same dimensional specifications as original Flowserve seals, ensuring direct drop-in installation. They use equivalent materials (SiC, TC, Carbon, Inconel) and manufacturing processes to match OEM performance for most industrial applications.

Q: What is the typical delivery time for Flowserve replacement seals from China?

A: Standard Flowserve-compatible seals typically have a delivery time of 2-4 weeks, depending on the specific series and material requirements. For standard ISC2 or RO series seals, manufacturers like MIAOYU often maintain inventory for quick shipment. Custom or API 682 compliant seals may require additional manufacturing time.

Q: How do I ensure I'm getting the right Flowserve series replacement for my application?

A: Always provide the original Flowserve part number, equipment specifications, and operating conditions (temperature, pressure, media, pH). Technical suppliers like MIAOYU can cross-reference the original specifications and recommend the optimal replacement series and material combination for your specific application requirements.

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