Non-rising Stem Resilient Seated Gate Valve

1. Product Overview

Non-rising stem resilient seated gate valve, also known as concealed stem soft seal gate valve, is an ideal shut-off device specially designed for limited installation space such as buried valve wells, underground pipe galleries and narrow pipeline chambers. Different from rising stem gate valves, its stem thread is hidden inside the valve bonnet without extending upward during opening and closing. Equipped with an integrally vulcanized EPDM rubber wedge, the valve realizes bidirectional zero leakage, fully compliant with drinking water sanitation and municipal water supply engineering standards.

2. Structural & Working Principle

The internal threaded sleeve drives the valve stem and rubber wedge to lift or lower vertically inside the valve body:

When rotating the handwheel to open the valve, the stem only rotates without protruding out of the bonnet; the wedge ascends inside the valve cavity to fully open the flow channel.

When closing, the wedge descends, and the elastic rubber on the wedge closely fits the valve body sealing surface for bubble-tight sealing.

The built-in multi-layer waterproof O-rings isolate underground mud, sewage and humid air, effectively preventing stem corrosion and external medium leakage.

A position indicator is installed on the top of the bonnet to visually display open/closed status without observing stem extension.

3. Main Material Advantages

Valve Body & Bonnet: High-strength ductile iron, full fusion bonded epoxy coating inside and outside, anti-rust, anti-corrosion, no secondary pollution to tap water.

Sealing Wedge: Ductile iron core with integral vulcanized food-grade EPDM rubber, strong adhesion, wear-resistant, self-compensating for machining gaps and sediment abrasion.

Valve Stem & Thread Sleeve: Stainless steel 2Cr13 / 304, anti-rust, low friction, smooth operation with small torque.

Sealing Packing: Imported rubber O-rings, aging-resistant, long-term underground buried service without water seepage.

4. Core Features

Compact overall height, greatly saving vertical installation space, perfectly matching buried pipelines and underground valve pits.

Concealed stem structure avoids stem damage caused by soil, collision or pedestrian trampling in buried conditions.

Visual open-close indicator for quick status judgment, convenient for pipeline inspection and maintenance.

Bidirectional tight sealing, no leakage under full pressure; straight-through flow passage with minimal fluid resistance, available for pipeline pigging.

Optional extended stem extension rod for deep buried valve wells, convenient ground surface operation.

Multiple driving modes: handwheel, gear operator, electric actuator, pneumatic actuator for automatic pipeline control.

5. Technical Parameters

Nominal Diameter: DN40 ~ DN1200

Nominal Pressure: PN10, PN16, Class 150

Applicable Medium: Municipal tap water, fire water, reclaimed water, river raw water, neutral industrial circulating water

Medium Temperature: 0°C ~ 80°C

Connection End: Flange RF/FF

Execution Standards: EN593, AWWA C509, GB/T 13927, WRAS, CE, ISO9001

6. Application Fields

Municipal buried water supply main pipelines and secondary water supply stations

Urban underground comprehensive pipe galleries and underground valve wells

Community residential fire protection and indoor water supply pipelines

Park landscape irrigation, sewage and rainwater collection pipelines

Industrial water circulation, water treatment and pumping station systems