Plastics Bib Taps, Pillar Taps, Angle Valves and Stop Valves for Hot and Cold Water Services
2000 Edition

IS 9763:2000 permits the use of specific plastics for manufacturing bib taps and valves for hot and cold water systems. The acceptable materials include PP Copolymer, Nylon 66, Polybutylene Terephthalate (PBT), Glass-Fiber reinforced Nylon 66, Poly-Acetal, ABS, ABS-PC alloys, and PVC for components such as the body, bonnet, and spindle. Handles may be made from PP Copolymer, PBT, Poly-Acetal, or ABS-based materials, while seals are typically rubber, nitrile PVC, or thermoplastic polyester elastomers. These materials must be safe for potable water use up to 90°C without affecting taste, odor, or appearance, demonstrate corrosion resistance, and comply with relevant IS standards to guarantee durability and safety.

According to IS 9763, pillar taps of nominal size 15 mm (1/2 inch) have defined dimensions such as a threaded size 'A' of G 1/2, minimum height 'B' of 42 mm, and other parameters including C (12.5–13.0 mm), D (minimum 42 mm), E (minimum 50 mm), F (minimum 25 mm), G (minimum 80 mm), and H (minimum 12.6 mm). For angle valves, the dimensions vary for 15 mm and 20 mm nominal sizes, with threaded sizes G 1/2 and G 3/4 respectively, and other dimensions like B, C, D, and E following specific minimum and range values to ensure proper fit and operation within recommended pressure and temperature limits.

The thermal shock test described in IS 9763 involves immersing the plastic tap or valve in water maintained at 65 ± 2°C for one hour, then rapidly transferring it to water at or below 15°C. This cycle is repeated ten times consecutively. The acceptance criteria require that no visible damage such as cracks, leaks, or deformation occurs after these cycles. Compliance must be certified for each batch. This test is part of type testing protocols ensuring the product withstands rapid temperature changes without degradation.

IS 9763 mandates several tests to verify mechanical integrity and sealing performance. The mechanical strength test requires applying a closing torque of at least 6 Newton-meters for five minutes, with no deformation or loosening allowed. Leak tightness is assessed through a hydraulic pressure test at 1.6 MPa for at least 60 seconds or an alternative pneumatic test at 0.6 MPa for 20 seconds, during which no leaks, bulges, or pressure drops should occur. These tests ensure the fittings maintain structural integrity and prevent leakage under operating conditions.

Per IS 9763, plastic taps and valves must bear clear identification marks including the manufacturer’s name or trademark, nominal size, and batch or manufacturing date for traceability. Stop valves must also display an arrow indicating flow direction. Additionally, color coding is specified for control devices: cold water controls are identified by a blue color or the letter 'C', while hot water controls use red or the letter 'H'. Optional markings include the BIS Standard Mark, which can be applied if the manufacturer is licensed by BIS. These markings ensure proper installation and compliance with regulatory requirements.