Khớp nối linh hoạt style B

The Style B flexible coupling by Piedmont is an efficient pipe-joining solution for fresh water, brackish water, and other high-pressure piping applications. Manufactured from corrosion-resistant 316 stainless steel, the coupling features a robust structure and a maximum working pressure of up to 600 psi (40 bar), making it suitable for demanding operating conditions. Its compact design, ease of installation, and NSF/ANSI 61-approved EPDM gasket ensure long-term safety, reliability, and consistent performance.

Brand: Piedmont

Product Type: Couplings

PRODUCT FEATURES

Maximum working pressure: Up to 600 psi (40 bar) when used with Schedule 40s pipe with cut grooves.
Premium material: 316 stainless steel (CF8M), compliant with ASTM A351, A743, and A744.
Gaskets: EPDM rubber, suitable for hot and cold water service; available in C-shaped or flush-fit designs; NSF/ANSI 61 approved.
Bolts and nuts: 316 stainless steel, round or hexagonal head with oval neck, compliant with ASTM F593/F594.
Corrosion-resistant and low maintenance, ideal for fresh water and brackish water applications.
Easy installation and maintenance, designed for Schedule 40s cut-groove piping systems.
Peroxide-cured EPDM gaskets available upon request for special applications (e.g. chloramine-containing water).
Size range: From ¾ inch to 12 inch, compatible with grooved piping systems.

SPECIFICATIONS

Nominal size

3/4 – 12 inch
Outside diameter

1.91 – 15.28 inch (48.5 – 388.1 mm)
Length

3.04 – 17.38 inch (77.2 – 441.4 mm)
Height

1.68 – 2.55 inch (42.7 – 64.8 mm)
Approx. weight

0.81 – 34.82 lb (0.37 – 15.8 kg)
Working pressure

600 psi (40 bar)

The Piedmont Style B flexible coupling is widely selected thanks to its durable design, corrosion-resistant materials, and reliable performance under harsh operating conditions. The product is well suited for industrial water systems, residential water distribution, and RO water treatment systems, offering a cost-effective and efficient pipe connection solution for a wide range of projects.

1. Technical specification of the Piedmont Style B flexible coupling

The Style B grooved coupling is manufactured from ASTM-compliant 316 stainless steel, delivering excellent mechanical strength and sealing performance. The coupling is compatible with multiple pipe sizes and standards, meeting the technical requirements of drinking water systems, industrial piping, and RO water treatment applications. Please refer to the specification tables above for a detailed overview of the product’s technical parameters.

NOMINAL SIZE	OUTSIDE DIAMETER	LENGTH	HEIGHT	APPROX. WEIGHT	PRESSURE RATING
¾ inch	1.91 inch (48.5 mm)	3.04 inch (77.2 mm)	1.68 inch (42.7 mm)	0.81 lb (0.37 kg)	600 psi (40 bar)
1 inch	2.29 inch (58.2 mm)	3.42 inch (86.8 mm)	1.68 inch (42.7 mm)	0.95 lb (0.43 kg)
1¼ inch	2.5 inch (63.5 mm)	3.65 inch (92.7 mm)	1.71 inch (43.4 mm)	1.09 lb (0.49 kg)
1½ inch	2.76 inch (70.1 mm)	4.06 inch (103.1 mm)	1.71 inch (43.4 mm)	1.18 lb (0.54 kg)
2 inch	3.24 inch (82.3 mm)	4.38 inch (111.3 mm)	1.85 inch (47 mm)	1.38 lb (0.63 kg)
2½ inch	3.74 inch (95 mm)	5.3 inch (134.6 mm)	1.85 inch (47 mm)	2.05 lb (0.93 kg)
3 inch	4.36 inch (110.7 mm)	5.88 inch (149.3 mm)	1.85 inch (47 mm)	2.4 lb (1.09 kg)
4 inch	5.7 inch (144.8 mm)	7.6 inch (193 mm)	2.02 inch (51.3 mm)	4.23 lb (1.92 kg)
6 inch	8.18 inch (207.8 mm)	10.25 inch (260.4 mm)	2.02 inch (51.3 mm)	9.12 lb (4.14 kg)
8 inch	10.89 inch (276.6 mm)	13.44 inch (341.5 mm)	2.34 inch (60.7 mm)	24.5 lb (11.1 kg)
10 inch	13.28 inch (337.3 mm)	15.88 inch (403.3 mm)	2.55 inch (64.8 mm)	33.46 lb (15.18 kg)
12 inch	15.28 inch (388.1 mm)	17.38 inch (441.4 mm)	2.55 inch (64.8 mm)	34.82 lb (15.8 kg)

Working pressure ratings:

PIPE WEIGHT	LESS THAN 2″ DIA.	BIGGER THAN 2″ DIA.
Schedule 40s	600 psi (40 bar)	600 psi (40 bar)
Schedule 10s	600 psi (34 bar)	350 psi (24 bar)
Schedule 5s	300 psi (20 bar)	175 psi (12 bar)

2. Key features of the Piedmont Style B flexible coupling

The Piedmont Style B flexible coupling is optimized for water systems requiring high durability and superior corrosion resistance. With a 316 stainless steel (CF8M) housing, EPDM rubber gasket suitable for hot and cold water, and an ASTM-compliant stainless steel bolt and nut set, the coupling delivers both mechanical strength and drinking-water safety. Key highlights include:

Maximum working pressure up to 600 psi (40 bar) when used with Schedule 40s cut-groove pipe.
316 stainless steel (CF8M) housing with excellent corrosion resistance, compliant with ASTM A351, A743, and A744.
EPDM gasket suitable for hot and cold water, NSF/ANSI 61 certified, available in C-shape and flush-fit designs.
316 stainless steel bolts and nuts, compliant with ASTM F593/F594, with round or hex head and oval neck design.
High durability with minimal maintenance, ideal for fresh water and brackish water applications.
Peroxide-cured EPDM gaskets available upon request for special applications (e.g. chloramine-containing environments).
Designed for installation with Schedule 40s, Schedule 10s, and Schedule 5s cut-groove pipes, enabling fast and easy installation.
Wide size range from 3/4 inch to 12 inch, meeting diverse piping connection requirements.

3. Advantages of the Piedmont Style B flexible coupling

Beyond its technical capabilities, the Style B grooved coupling offers significant practical benefits during operation. Thanks to its optimized design and premium materials, the product ensures long-term, reliable performance in systems with demanding pressure and material requirements:

High pressure resistance ensures stable operation in RO systems and high-pressure water distribution networks.
316 stainless steel body and EPDM gasket provide excellent corrosion resistance and extended service life.
Smart design allows easy installation, removal, and maintenance, reducing labor time and costs.
Minimal maintenance requirements help lower long-term operating costs.
Broad size range and compatibility with various industrial and residential piping configurations.
Compliance with international standards such as ASTM F593/F594, ASTM A351/A743/A744, and NSF/ANSI 61, ensuring safety for drinking water and specialized water treatment systems.

4. Quality standards of the Piedmont Style B flexible coupling

Selecting internationally certified couplings is essential to ensure the safety, reliability, and longevity of piping systems. The Piedmont Style B coupling is designed and manufactured in accordance with strict standards to deliver optimal performance and long service life:

Housing materials comply with ASTM A351, A743, and A744, ensuring excellent mechanical properties and corrosion resistance.
Bolts and nuts are manufactured according to ASTM F593 and F594, providing stable tightening performance and high load-bearing capacity in water environments.
EPDM gaskets are NSF/ANSI 61 certified, ensuring safe use in drinking water systems.

Thanks to full compliance with these international standards, the Piedmont Style B flexible coupling is trusted not only in the United States but also widely applied in many countries worldwide.

5. Applications of the Piedmont Style B flexible coupling

The Piedmont Style B flexible coupling is highly regarded for its high-pressure capability, flexibility, and exceptional durability across a wide range of environments. In practice, actual applications often impose more demanding conditions than nominal pressure ratings.

Therefore, when selecting Piedmont couplings—particularly the 316 stainless steel Style B grooved coupling—additional operating factors such as temperature and mechanical loads should be considered to ensure overall system performance and service life. Typical applications include:

Brackish water RO (BWRO) and seawater RO (SWRO) systems.
Pipe connections in water supply, backwash lines, ultrafiltration (UF), and microfiltration (MF) systems.
Low-pressure lines in energy recovery systems.
High-pressure water supply and treatment systems in industrial and residential applications.
Use in food & beverage, pharmaceutical, and medical systems thanks to corrosion resistance and NSF/ANSI 61 compliance.

6. Authorized supplier of Piedmont Style B flexible couplings in Vietnam

Choosing an authorized distributor is essential to ensure product authenticity and reliable technical support. ATS Water Technology Co., Ltd. is proud to be the official representative of Piedmont flexible couplings in Vietnam, including the premium Style B pipe coupling, widely used in RO and industrial water treatment systems.

With over 15 years of experience in the water treatment industry, ATS Water Technology provides not only genuine products with clear origin, but also professional system design consultation, technical solutions, in-depth engineering support, and complete product documentation.

Our team of engineers is always ready to assist you in selecting the most suitable coupling for each specific application. Contact ATS Water Technology today for fast and professional support.

ATS WATER TECHNOLOGY CO., LTD

Head office: 54/18 Bui Quang La, An Hoi Tay Ward, HCMC, Vietnam
Branch office: 77 DHT10B, Dong Hung Thuan Ward, HCMC, Vietnam
Consultation and support: (028) 6258 5368 – (028) 6291 9568
Email: info@atswatertechnology.com
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TECHNICAL DOCUMENTS

Style B – Medium pressure – Datasheet

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Style B coupling assembly – Drawing

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Piedmont grooved-end flexible couplings – Installation and Maintenance Manual

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