China Customized Non-Rising Stem Gate Valves Suppliers - Low Price Non-Rising Stem Gate Valves

Non-Rising Stem Gate Valves

Reliable Non-Rising Stem Gate Valve Manufacturer & Supplier for Global Industrial Applications

Non-Rising Stem Resilient Seated Gate Valve
The Non-Rising Stem Resilient Seated Gate Valve provides zero-leakage fluid isolation for water distribution and space-restricted piping systems. Its non-rising stem maintains a constant vertical height during operation, making it
read more

Product Overview

Non-Rising Stem Gate Valves are heavy-duty isolation valves engineered for water, wastewater, and industrial piping networks. Unlike rising stem models, the stem threads turn internally within the valve body, maintaining a fixed operating height. This compact footprint makes them ideal for shallow trenches, confined vaults, and buried pipelines. Featuring a resilient EPDM or NBR wedge, these valves deliver a 100% bubble-tight shut-off, low operating torque, and long-term corrosion resistance in demanding installations.

Technical Specifications

Item	Standard Specification
Product Type	Resilient Seated Non-Rising Stem Gate Valve
Nominal Size	DN40–DN300 (1.5"–12") / Larger sizes on request
Pressure Rating	PN10 / PN16 / Class 125 / Class 150
Body & Wedge	Ductile Iron GGG50 + EPDM / NBR Vulcanized Wedge
Stem & Nut	Stainless Steel (SS420/SS304/SS316) + Brass Nut
Face-to-Face	DIN 3202 F4/F5, EN 558-1 Series 14/15, BS 5163
Flange Standard	EN 1092-2, DIN 2501, ANSI B16.1, BS 4504
Coating	Internal & External Fusion Bonded Epoxy (FBE) $\ge 250\,\mu\text{m}$
Operation	Handwheel, Square Nut, Bevel Gear, Electric Actuator

Key Features of Non-Rising Stem Gate Valves

01/

Compact Non-Rising Stem Design
The stem stays inside the body during operation, saving vertical clearance in constrained locations.

02/

Zero-Leakage Resilient Seating
The rubber-coated wedge seals tightly against the inner body wall for a reliable shut-off.

03/

Space-Saving Footprint
Static height allows seamless installation in compact chambers and shallow ground excavations.

04/

Corrosion-Resistant Epoxy Finish
Electrostatic epoxy powder protects metal surfaces from soil moisture, chemical attack, and rust.

05/

Low-Torque Smooth Operation
Precision-machined threads and brass stem nuts ensure easy manual turning under full pressure.

06/

Direct-Buried Pipeline Compatibility
Without exposed external threads, these valves integrate cleanly into underground water networks.

Construction & Working Principle

Actuation & Stem Rotation
Turning the handwheel or square nut rotates the fixed stem without altering the valve's outer height.

Internal Wedge Engagement
The rotating stem turns inside the wedge nut, moving the encapsulated wedge up or down.

Isolation & Flow Control
Lowering the wedge compresses the rubber seal for full isolation; raising it opens an unobstructed flow path.

Materials & Configuration

Component	Standard Material Options	Grade / Standard
Body & Bonnet	Ductile Iron	GGG50 / EN-GJS-500-7
Wedge	Ductile Iron + Elastomer	EPDM (Water) / NBR (Sewage/Oil)
Stem	Stainless Steel	AISI 420 / 304 / 316
Stem Nut	Brass / Bronze	CuZn39Pb3 / High-tensile Brass
Bolts & Gaskets	Carbon Steel / Stainless Steel + NBR	Grade 8.8 / SS304 with wax seals

Applications of Non-Rising Stem Gate Valves

Municipal Water Networks

Reliable flow control across drinking water distribution systems and main lines.

Wastewater Treatment Systems

Durable sealing performance in sewage plants, effluent discharge, and sludge lines.

Underground Buried Lines

Ideal for direct soil burial when paired with extension spindles and surface boxes.

Agricultural & Turf Irrigation

Efficient flow management for large-scale farm and municipal irrigation channels.

Industrial Process Water

Maintains utility, cooling, and raw water transport in factory infrastructure.

Fire Protection Infrastructure

Main isolation service for municipal and industrial fire pump water lines.

How to Choose

Determine Pipeline Size
Identify nominal size needs, typically from DN40 to DN300 or larger.

Confirm Pressure Rating
Match system line pressure to PN10, PN16, Class 125, or Class 150.

Select Body & Seat Material
Specify Ductile Iron (GGG50) with EPDM for clean water or NBR for wastewater.

Confirm Connection Standard
Verify flange drilling standards such as DIN, EN, BS, or ANSI B16.1.

Choose Actuation Method
Select handwheel for exposed rooms, square top nut for underground T-key use, or gear operator.

Verify Standards & Certification
Check project compliance requirement details, such as EN 1074-1/2, WRAS, or NSF testing options.

Non-Rising Stem vs. Rising Stem Gate Valves

Feature	Non-Rising Stem (NRS)	Rising Stem (OS&Y)
Stem Movement	Rotates on fixed axis; stays inside body	Moves up and down vertically
Installation Profile	Low height; fixed space requirement	Taller clearance needed for open stem
Underground Use	Ideal; threads protected from dirt and soil	Poor; exposed threads collect debris
Visual Position	Requires mechanical indicator	Stem height shows open/closed state
Space Footprint	Extremely compact	Requires significant vertical clearance

Quality Control & Manufacturing Process

Raw Material Verification Chemical and mechanical testing on iron batches and raw elastomers prior to casting.

Precision Machining CNC machining ensures accurate seating faces, tight flange tolerances, and smooth stem threads.

Vulcanization & Coating Inspection Epoxy coating thickness (greater than or equal to 250 microns) and rubber bonding tests guarantee long-term durability.

Hydrostatic Pressure Testing 100% of finished valves undergo shell (1.5x PN) and seat (1.1x PN) pressure testing per EN 12266-1.

Final Quality Inspection Visual check, flange measurement, operating torque check, and mill test certification preparation.

OEM, ODM & Custom Solutions

Custom Dimensions & Drill Pattern

Special face-to-face lengths and customized flange standards for retrofit jobs.

Upgraded Metallurgy

Duplex stainless steel stems, specialized bronze alloys, and custom seal formulations.

Custom Protective Coatings

Adjustable epoxy powder thickness, specialized RAL colors, and severe-duty coatings.

Private Labeling & Branding

Cast logo options, customized stainless steel nameplates, and targeted export packaging.

Why Choose Us

Global Supply Experience
Proven delivery track record to municipal engineering projects and major overseas distributors.

One-Stop Valve Portfolio
Complete supply chain for gate, butterfly, check, globe, ball valves, and pipe expansion joints.

Strict Quality Assurance
Full traceability, standard EN 10204 3.1 material certificates, and pressure testing reports.

Tailored OEM/ODM Capability
Flexible custom manufacturing covering special sizes, custom branding, and project packaging.

FAQ

Q: What is a non-rising stem gate valve?

A: It is an isolation valve where the stem rotates internally to raise or lower the wedge without extending outside the body.

Q: What is the main benefit of a non-rising stem design?

A: It keeps a constant external height during operation, saving space in tight plant rooms, trenches, and underground vaults.

Q: Are these valves suitable for direct soil burial?

A: Yes. Because internal threads are shielded from soil grit, they work effectively underground with extension spindles and surface boxes.

Q: Which wedge rubber compound should I choose?

A: Choose EPDM for drinking water and general utility lines. Choose NBR for wastewater, sewage, or fluids containing oil traces.

Q: What standards do your valves conform to?

A: Our gate valves conform to EN 1074-1/2, DIN 3202 F4/F5, EN 558-1, BS 5163, and ANSI B16.1 specifications.

Q: Do you offer OEM branding and custom dimensions?

A: Yes. We offer custom body dimensions, special flange drilling, custom epoxy colors, and private-label logo placement.

Q: Are material certificates and pressure test reports included?

A: Yes. We provide EN 10204 3.1 material test certificates and factory hydrostatic test reports with each batch.

Q: What information is needed for an accurate quotation?

A: Provide nominal size (DN), pressure class (PN), body material, seat rubber type, flange standard, and total quantity.

Ready to Source High-Performance Gate Valves?

Contact our engineering sales team today to discuss your technical specs, request custom dimensions, or receive a quick price quotation.

Get a Fast Quote

We're professional non-rising stem gate valves suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized non-rising stem gate valves at low price from our factory. For more cheap products, contact us now.