PPR Double Union Gate Valve

A PPR Double Union Gate Valve is an integral, maintenance-friendly component designed specifically for Polypropylene Random Copolymer (PPR) piping systems. Its primary function is to provide reliable, on/off flow control for liquids within the pipeline. The valve operates via a linear-motion gate that fully opens to allow unimpeded flow or completely closes to form a tight seal. The defining "double union" design incorporates two separable union nuts on either side of the valve body, enabling easy installation, removal, and future service without the need to cut the PPR pipes. This feature is crucial for system maintenance, component replacement, and modifications in residential and commercial plumbing, water distribution, and radiant heating applications.

Product Feature and Application

The PPR Double Union Gate Valve is designed for reliable shut-off control in plastic piping systems.It features a corrosion-resistant PPR body and double union connections, allowing easy installation, removal, and maintenance without cutting pipes. The smooth gate operation ensures low flow resistance and good sealing when fully open or closed.

This valve is widely used in hot and cold water supply systems, HVAC installations, and residential or commercial plumbing where durability, leak-free performance, and convenient servicing are required.

Product Parameter

Technical Specification

Nominal Pressure: 1.6 MPa

Working Medium: Water, Oil, Non-corrosive and Non-flammable Gases

Operating Temperature: -10 °C ≤ T ≤ 120 °C

Thread conforms to ISO 228 standard

Product Dimension

Installation Guidelines

1.Clean and prepare the piping system thoroughly before installing the valve.

2.Before installation, remove any protective end caps and inspect the valve ports and seating surfaces to ensure they are clean.

3.Provide adequate support for the valve to avoid stress from connecting piping.

4.Confirm that the valve’s pressure and temperature ratings are suitable for the intended service conditions.

5.Before placing the valve into service, cycle it fully from open to closed to verify smooth operation.

6.After installation, check that the packing nut is properly tightened.

7.For gate and globe valves, it is recommended to install with the stem vertical and the operating handle on top.

Operating Instructions

PPR Double Union Gate Valves are manually operated. Turn the handle counterclockwise to open and clockwise to close.

Inspection and Maintenance

1.Routine inspection and preventive maintenance are generally not required, aside from occasional adjustment of stem packing and periodic cycling of the valve from open to closed.

2.If a packing leak occurs, tighten the packing nut clockwise by about a quarter-turn—or until leakage stops—to increase sealing pressure on the stem packing. Never repack a valve while it is under system pressure.

3.When replacing the valve stem, also replace the packing material.

Replacement Parts

Under normal operating conditions, replacement parts are seldom needed. Recommended spare parts for each valve type include: Handle, handle nut, packing, gland, packing nut.

When ordering parts, please provide the valve’s figure number, size, required part, and approximate age.