Direct Coupling

Product Overview

Sikerui UPVC Direct Coupling is a high-performance pipe fitting engineered from unplasticized polyvinyl chloride (UPVC), designed to create seamless, inline connections between two pipes of identical diameters. This straightforward yet critical component ensures continuous flow in plumbing and industrial systems, leveraging UPVC’s renowned durability, corrosion resistance, and cost-effectiveness. Manufactured to meet international standards such as DIN and ISO 4422, it excels in demanding environments including water supply, chemical transport, drainage, and irrigation. With a service life exceeding 50 years, UPVC Direct Couplings combine lightweight simplicity with robust performance, offering a sustainable alternative to metal fittings. Their smooth interior minimizes flow disruption, while resistance to chemicals, UV radiation, and abrasion guarantees reliability in diverse applications.

Features of UPVC Direct Coupling

Exceptional Corrosion Resistance: Highly resistant to acids, alkalis, and chemical corrosion, making it ideal for industrial effluents, agricultural chemicals, and saline water environments without degradation.
Leak-Free Solvent Cement Joints: Designed for simple socket-end connections using UPVC-specific cement, ensuring robust, permanent bonds that withstand pressures of PN10-PN16 (1.0–1.6 MPa).
Smooth Interior Surface: The precision-molded inner wall minimizes friction loss, prevents clogging from sediment or scale, and maintains optimal flow efficiency in water or chemical transport.
Lightweight and Easy Installation: Up to 50% lighter than metal equivalents, reducing handling effort and labor costs. Installation involves basic steps: apply cement, insert pipes, and allow setting.
Long Service Life: Rated for temperatures from 0°C to 60°C (SCH80 variants handle up to 75°C) and pressures up to PN16, ensuring over 50 years of reliable service with minimal maintenance.
Eco-Friendly and Potable Water Safe: Complies with drinking water standards (e.g., ISO 4422), featuring non-toxic, odorless material suitable for freshwater systems.

Typical Uses of UPVC Direct Coupling

Potable Water Distribution: Connects straight pipeline sections in municipal or residential water networks. Its non-corrosive nature ensures no taste, color, or odor contamination, unlike metal pipes.
Industrial Chemical Lines: Ideal for plants transporting corrosive fluids, acids, or alkalis, where chemical resistance prevents leaks and extends system lifespan.
Agricultural Irrigation: Joins main and branch lines in sprinkler or drip systems, resisting fertilizers and pesticides while enduring UV exposure in outdoor settings.
Mining and Drainage: Used in dewatering or ventilating mines to connect pipes carrying abrasive or acidic liquids, thanks to durability and easy installation in confined spaces.
Electrical Conduit Systems: Provides straight runs for cable protection, acting as an insulating sleeve that safeguards against moisture and physical damage.

Range of Production

Sikerui UPVC Direct Couplings are available in sizes from DN20 to DN400 (1/2″ to 16″), supporting standard pressure classes PN10 and PN16. Customizations include material thickness (SCH40/SCH80), connection types (solvent cement, threaded ends), and colors (gray, white, blue). All products adhere to DIN, ISO 4422, and ASTM standards, with certifications for global export.

SIZE	Number	D1	D2	L1	L2
DN15	ZJ15	20.3	26.3	16.5	34.4
DN20	ZJ20	25.3	31.9	19	39
DN25	ZJ25	32.35	39.95	22.5	46.27
DN32	ZJ32	40.4	49.8	26.5	54.38
DN40	ZJ40	50.45	60.25	31.5	64.39
DN50	ZJ50	63.5	75.9	38	85.11
DN65	ZJ65	75.5	88.91	44	90.16
DN80	ZJ80	90.55	105.15	51.5	106.32
DN100	ZJ100	110.6	127.39	61.5	138.49
DN125	ZJ125	140.6	161.4	76	159.61
DN150	ZJ150	160.7	184.5	86.5	179.35
dn200	ZJ200	200	228.1	106.2	218
DN200	ZJ200	226.2	253.8	118.5	243.03
dn250	ZJ250	250	281.89	131.5	268
DN250	ZJ250	281.5	315.5	147	299
DN300	ZJ300	316.7	355	165	343
DN350	ZJ350	356.8	395	185	376
DN400	ZJ400	402	442	208	424
DN250 (PN10)	ZJ250	280.6	306	147	299
DN300 (PN10)	ZJ300	315.7	344	166	343
DN350 (PN10)	ZJ350	355.8	385	183.5	373
DN400 (PN10)	ZJ400	401	432	208	423

FAQs of Sikerui UPVC Direct Coupling

Q1: Can you customize Direct Couplings for non-standard lengths or diameters?

Yes, we offer tailored solutions for dimensions (DN15–DN600), pressure ratings, and connection methods (e.g., threaded ends) to meet specific project needs.

Q2: How can I evaluate the product quality before placing a bulk order?

Sample couplings are available for testing. Specifications are confirmed within 3–5 days, with samples shipped within one week after agreement.

Q3: What is the typical lead time for orders?

Standard delivery takes 2–3 weeks after order confirmation. Urgent orders for common sizes (e.g., DN25–DN110) can be expedited.

Q4: How do you handle quality issues?

Each coupling undergoes pressure and material checks per ISO 9001. Verified defects are covered by a warranty, with replacements or refunds processed promptly.

Q5: What payment terms do you accept?

We support T/T, L/C, and options like 30% advance payment. Trade terms (EXW, FOB, CIF) are flexible for international clients.