Description
upvc Reducing Bush 4×2″
upvc reducing Bush. GM made in Pakistan ASTM uPvc Sch-40 Pressure Fittings, Drain sewer ventilation
What is upvc Reducing Bush 4×2″ GM ?
Specifications
uPVC Schedule 40 fittings adhere to international standards like ASTM D2466 for fittings and ASTM D1785 for pipes, ensuring compatibility and performance. Below is a summary of key specifications for the 4×2″ reducing bush:
| Parameter | Details |
|---|---|
| Material | Unplasticized Polyvinyl Chloride (uPVC) |
| Nominal Sizes | 4″ (large end) x 2″ (small end) |
| Schedule | Schedule 40 (medium wall thickness for balanced strength and cost) |
| Pressure Rating | Up to 160 PSI at 73°F (23°C); derates with temperature (e.g., ~100 PSI at 100°F) |
| Temperature Range | Maximum 140°F (60°C) continuous; suitable for cold water only |
| Connection Type | Socket x Socket (slip fit on both ends; male insertion for reduction) |
| Standards | ASTM D2466 (fittings), ASTM D1785 (pipes), NSF/ANSI 14, 61, 372 (lead-free, potable water compliant) |
| Color | Grey (GM variant for high-pressure/industrial use) |
| Dimensions (approx.) | Large end OD: 4.5″ (114.3mm); Small end ID: 2.067″ (52.5mm); Length: 2-3″ (50-75mm) depending on manufacturer |
| Weight | ~0.3-0.5 lbs (0.14-0.23 kg) |
Note: Exact dimensions may vary slightly by manufacturer (e.g., ERA, Ashirvad, or Sunplast); always verify with the supplier for precise measurements.
Usage
This reducing bush is ideal for high-pressure water distribution and industrial applications where pipe diameter transitions are needed without compromising flow or integrity. Common uses include:
- Irrigation and Agriculture: Connecting main supply lines to smaller branch lines in drip or sprinkler systems.
- Plumbing and Potable Water: Cold water supply in residential, commercial, or municipal systems, including chilled water lines.
- Pools and Spas: Integrating larger inlet pipes to smaller outlets or filters.
- Industrial and Chemical Processing: Handling non-aggressive fluids in chemical plants, aquaculture, or wastewater systems due to its corrosion resistance.
- Landscaping and Drainage: Adapting pressurized lines for outdoor features like fountains or drainage outlets.
It is not suitable for hot water (above 140°F) or gas applications. The Schedule 40 rating provides high tensile and impact strength, with excellent abrasion resistance for slurries or erosive fluids, outperforming metal alternatives that may rust.
Installation
Installation is straightforward using solvent cement welding (cold joining method), requiring no special tools beyond a pipe cutter, deburring tool, and applicator. Follow these steps for a secure, leak-proof connection:
- Preparation:
- Cut pipes to length using a PVC pipe cutter for square ends.
- Deburr and bevel pipe ends with a reamer or sandpaper to remove sharp edges.
- Clean mating surfaces (inside fitting sockets and outside pipe ends) with a dry cloth to remove dirt or moisture.
- Priming:
- Apply PVC primer to the outside of the pipe end (about 2-3 inches) and the inside of the fitting socket. Let it dry for 10-15 seconds (it softens the surfaces for bonding).
- Cementing:
- Quickly apply a thick, even layer of uPVC solvent cement to the primed pipe end and a lighter layer inside the socket.
- Insert the pipe (or male end of the bush) into the socket with a quarter-turn twist for even distribution. Hold firmly for 30 seconds to set.
- Curing:
- Allow 15-30 minutes cure time before handling; full pressure testing after 24 hours.
- For the reducing aspect, ensure the 4″ end connects to the larger pipe/fitting and the 2″ end to the smaller one.
Tips:
- Work in temperatures between 40°F-110°F (4°C-43°C) for best adhesion.
- Use medium-body cement for Schedule 40; avoid over-application to prevent drips.
- Pressure-test the system at 1.5x operating pressure after full curing.
- For threaded variants (if applicable), use PTFE tape, but most GM bushings are solvent-weld.
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