NRS Ductile Iron Gate Valve

NRS Ductile Iron Gate Valve Manufacturer in India supports dependable shut-off across water pipelines.

NRS Ductile Iron Gate Valve Manufacturer in India

A NRS ductile iron gate valve uses an internally threaded stem that rotates within the valve while the gate moves vertically to isolate the pipeline. Because the stem does not rise above the body, the valve has a compact operating profile that is particularly useful in buried water networks, valve chambers and installations with restricted overhead clearance. Speciality Valve manufactures NRS ductile iron gate valve configurations for water and utility isolation, with the body, wedge, stem, seat and connection arrangement selected according to the service requirements.

Resilient Wedge and Stem Arrangement:

Non-rising stem: The stem rotates internally without moving vertically outside the valve.
Wedge movement: Stem rotation drives the wedge toward or away from the seating surfaces.
Resilient seating: An elastomer-covered wedge can provide tight shut-off when correctly matched to the service.
Full opening: The wedge moves clear of the principal flow passage when fully open.
Low-profile operation: The absence of external stem travel helps reduce required installation height.
Buried installation: The compact arrangement is well suited to underground valve chambers and water-main installations.
Isolation service: Gate valves are intended primarily for fully open or fully closed operation rather than continuous throttling.

Ductile Iron Gate Valve Construction:

Component	Typical Construction
Body	Ductile iron pressure-containing body
Bonnet	Ductile iron or specified pressure-rated construction
Wedge	Ductile iron with resilient elastomer covering where specified
Stem	Stainless steel non-rising stem
Stem Nut	Bronze or other specified corrosion-resistant material
Seat	Resilient seat arrangement
Sealing Material	EPDM, NBR or specified elastomer
Protection	Protective coating suitable for the intended service

Ductile Iron Valve Material Grades:

Grade / Specification	Material Classification
ASTM A536 65-45-12	Ductile Iron
EN-GJS-500-7	Ductile Iron
SS304	Austenitic Stainless Steel
SS316	Molybdenum-Bearing Stainless Steel
ASTM B62	Cast Bronze

NRS Ductile Iron Gate Valve Technical Data:

Parameter	Technical Details
Valve Type	Non-Rising Stem Gate Valve
Body Material	Ductile Iron
Stem Arrangement	Internally Threaded, Non-Rising
Closure	Wedge Type
Seat Design	Resilient Seated, where specified
Operation	Handwheel or gear-operated, according to size and design
Primary Duty	On-Off Pipeline Isolation
Installation	Above-ground or buried, according to configuration
End Connections	Flanged or other specified waterworks connection

Pressure, Size and Connection Selection:

Requirement	Selection Consideration
Nominal Size	Determined from pipeline diameter and flow requirements
Pressure Rating	Selected according to valve standard and system pressure
Flanged Ends	Matched to the applicable pipeline flange standard
Mechanical Joint	Used with compatible ductile-iron piping systems
Push-On Ends	Available for applicable waterworks configurations
Grooved Ends	Considered where supported by the valve design
Operating Mechanism	Handwheel, operating nut or gear arrangement as required

Standards and Testing:

AWWA C509: Resilient-seated gate valves for water-supply service.
AWWA C515: Reduced-wall resilient-seated gate valves for water-supply service.
EN 1074: Requirements for valves used in water supply systems where applicable.
EN 1171: Industrial gate-valve requirements for applicable configurations.
ASME B16.10: Face-to-face and end-to-end dimensions where applicable.
ISO 5208: Pressure and leakage testing where applicable.
Shell testing: Verification of pressure-boundary integrity.
Seat testing: Verification of closure and leakage performance.

NRS Ductile Iron Gate Valve Applications:

Municipal water mains: Sectional isolation for distribution and transmission pipelines.
Water treatment plants: Isolation of raw-water, treated-water and utility piping.
Fire-water networks: Shut-off service for compatible hydrant and fire-protection systems.
Irrigation pipelines: Isolation of agricultural and water-distribution lines.
Wastewater systems: Sectional isolation in compatible treatment and utility piping.

Discuss your pipeline requirements with Speciality Valve to select the appropriate ductile iron body, resilient seating and non-rising stem arrangement for the intended service.