Rising Stem Resilient Seated Gate Valve

1. Product Overview

Rising Stem (RS) Resilient Seated Gate Valve is a popular soft-seal isolation valve used for above-ground pipelines, pump rooms, water plants and open valve chambers. Unlike non-rising stem types, its valve stem extends upward visibly when opening the valve, offering direct visual confirmation of open/closed position at a glance. Equipped with an integrally vulcanized EPDM rubber wedge, this valve delivers bidirectional zero leakage and fully meets sanitary standards for potable water. It is the preferred shut-off valve for installations where real-time flow status monitoring is required.

2. Working Principle & Structure

The stem features external exposed threads outside the bonnet.

Opening: Turn the handwheel counterclockwise. The stem rotates and moves upward, lifting the rubber wedge fully out of the flow path. The exposed rising stem clearly shows the opening degree.

Closing: Rotate the handwheel clockwise to lower the stem and wedge. The elastic EPDM lining on the wedge presses tightly against the valve body sealing surface to form bubble-tight sealing.

Multi-layer graphite and rubber packing inside the bonnet prevents medium leakage along the stem during long-term operation.

External thread design allows easy lubrication and inspection, reducing jamming risk caused by rust or sediment.

3. Main Materials & Advantages

Valve Body & Bonnet: High-grade ductile iron, fully coated with fusion bonded epoxy internally and externally, anti-corrosion and harmless to drinking water.

Sealing Wedge: Ductile iron substrate with fully vulcanized food-grade EPDM rubber, high adhesion, wear resistance, self-compensating sealing for minor abrasion.

Valve Stem: Stainless steel 2Cr13 / SS304, anti-rust, high tensile strength, smooth lifting movement.

Packing & Gaskets: Aging-resistant elastic rubber packing, stable sealing performance under temperature fluctuation.

4. Core Product Features

Visible rising stem: Directly observe opening stroke to judge flow volume, no extra position indicator needed.

External stem threads are easy to clean, lubricate and maintain, greatly lowering failure rates.

Straight full bore flow channel, minimal pressure loss, suitable for pipeline pigging and medium containing fine sediment.

Bidirectional tight shutoff, passing zero leakage test per international valve standards.

Low operating torque, effortless manual operation; compatible with gear operators, electric and pneumatic actuators for automatic control.

Simple disassembly structure, convenient on-site replacement of rubber wedge without cutting pipelines.

5. Standard Technical Specifications

Nominal Diameter: DN40 ~ DN1200

Nominal Pressure: PN10, PN16, Class 150

Working Medium: Tap water, fire water, reclaimed water, industrial circulating clean water, landscape water

Medium Temperature: 0℃ ~ 80℃

Connection Type: RF/FF flanged ends

Compliance Standards: EN 593, AWWA C509, GB/T 13927, WRAS, CE, ISO9001

6. Typical Application Scenarios

Water treatment plants, water supply pump stations and overhead main pipelines

Indoor fire protection and water supply piping in commercial buildings, factories and residential complexes

Open valve chambers, above-ground pipe racks and industrial circulating water systems

Agricultural irrigation stations, surface water delivery pipelines

Water treatment equipment and water tank outlet pipelines