MSS SP-81 Knife Gate Valve, Stainless Steel, DN50-DN400, Wafer

Product Name: Knife Gate Valve, Bidirectional Sealing
Design Standard: MSS SP-81, JB/T 8691-2013
Body Material: Stainless Steel
Size Range: DN50-DN400, 2-16 Inches
Pressure: PN10, PN16, Class 150 LB
Connection Method: Clamp (Wafer)
Test Standard: API 598, GB/T 13927-2008
Packing: Aramid, high Water Base, PTFE (Teflon), Rubber
Stem Type: Rising/Non-rising Stem (Handwheel)

Part Material Table

Double Seal Knife Gate Valve Description

The valve features an integrated structure with a cast iron body, gate, and U-shaped sealing strip.

The body has grooves on both sides and at the bottom of the chamber, fitted with elastic U-shaped sealing strips.

When the valve is closed, the gate moves down to compress the sealing strip into the grooves, ensuring a tight seal between the body and the gate.

When the valve is opened, the gate lifts, releasing the sealing strip which then springs back to a flat position with the grooves.

This design prevents medium sediment from accumulating in the grooves, avoiding blockages and residue, facilitating pipeline cleaning, and enhancing the valve's sealing performance to prevent leaks upon closure.

Product Features

The gate has a bottom bevel design.

The body includes wedge blocks on both sides.

These features ensure the gate's limiting position when closed, effectively extending the life of the seal.

The two-piece new-style support increases the strength of the support structure.

The body is designed with a flow guide to prevent fluid stagnation within the valve chamber.

A PTFE limit block ensures the gate does not contact the body, prolonging the gate's service life.