PVC Knife Gate Valve Socket Connection

PVC Knife Gate Valve

A cost-effective, corrosion-free way to shut off water and light-chemical flow in plastic pipelines. This PVC knife gate valve — also referred to as a PVC knife valve — is built for buyers who need a lightweight, non-metallic shut-off solution that won't rust, scale, or seize up in wet or chemically active environments, and who want a straight, full-bore flow path rather than the restricted opening of a standard ball or globe valve.

Technical Specifications

Note: For media beyond water (light chemicals, treated wastewater, etc.), contact us to confirm seal material compatibility before ordering.

Why PVC Construction？

Unlike ductile iron or steel gate valves, this valve's U-PVC body will not corrode, rust, or pit — even in constant contact with water, mild chemicals, or humid outdoor environments. It's significantly lighter than a metal equivalent, which lowers shipping cost and makes field installation and maintenance faster, especially on smaller residential, agricultural, and light industrial systems. It's also electrically non-conductive, which matters in certain water treatment and aquaculture setups.

Where This Valve Is Used

• Irrigation and agricultural water lines

• Swimming pool, spa, and water park circulation systems

• Aquaculture and fish farming systems

• Water treatment and filtration plant isolation points

• Drainage and wastewater collection lines

• Light chemical feed and dosing lines

• General plumbing isolation on plastic pipe networks

Choosing the Right Size: 4" vs 6" PVC Knife Gate Valve

Both the 4" (DN100) and 6" (DN150) versions share the same PN10–PN16 pressure rating and socket connection — the difference between them is flow capacity and the scale of the system they're built for, not pressure performance. Choosing the right one comes down to matching the valve to your pipe size and the volume of flow passing through that line.

4" PVC Knife Gate Valve (DN100)
This is typically the size used on medium-capacity lines: submains in irrigation systems, circulation lines on mid-size commercial pools and water parks, backwash lines on mid-size filtration and water treatment skids, and isolation points on medium-scale aquaculture systems. If you're replacing or specifying a valve on a 4-inch plastic pipe run, this size is a direct match without needing a reducer fitting.

6" PVC Knife Gate Valve (DN150)
This size is used on larger trunk lines and higher-flow systems: main irrigation trunk lines, larger commercial or municipal pool/water park circulation systems, main isolation points on bigger water treatment and filtration plants, and larger aquaculture facility drainage lines. If your project pipe size is 6 inches, or if a 4" valve would create a bottleneck relative to your system's flow rate, the 6" version keeps the flow path unrestricted.

If you're unsure which size fits your system, send us your pipe diameter and approximate flow rate (or your engineering drawing) and we'll confirm the correct size before you order — this avoids costly reducer fittings or an undersized valve that restricts flow.

Frequently Asked Questions

Q:What is the difference between a PVC knife gate valve and a PVC ball valve?
A PVC knife gate valve opens to a full, unrestricted bore, making it better suited to drainage, filtration, and flow lines where minimizing flow restriction matters. A PVC ball valve gives a tighter, more compact shut-off and is typically preferred for general clean-water isolation where space is limited.

Q:What's the difference between the 4" and 6" versions?
Both share the same PN10–PN16 pressure rating; the difference is flow capacity and the pipe size they match. The 4" (DN100) suits medium-capacity lines, while the 6" (DN150) suits larger trunk lines and higher-flow systems. Match the valve to your existing pipe diameter to avoid needing a reducer fitting.

Q:Can this valve handle chemicals other than water?
The standard configuration is rated for water. For chemical media, contact us with the specific chemical and concentration so we can confirm seal material compatibility (EPDM or NBR) before you order.

Q:What sizes are available?
This valve is available from 1-1/4" (DN32) up to 6" (DN150) with socket connection.

Q:Can the body or handle color be customized?
Yes. Body and handle color can be produced to your specification, including white, gray, or other colors on request.

Q:Do you offer custom sizes or connection types beyond what's listed?
Yes. Send us your drawing or required specification and our engineering team will confirm whether a custom configuration is feasible.

Get a Quote for Your Project

Tell us your pipe size, working pressure, connection type, and operating medium, and our team will confirm the right configuration for your PVC knife gate valve along with pricing and lead time. Whether you need a single valve for a pilot installation or a bulk order for an irrigation, water treatment, or aquaculture project, we'll respond with a detailed, no-obligation quote.

Contact us for more informations.