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Válvula de gaveta NRS de junta mecânica com sede resiliente e poste indicador
Mechanical Joint Resilient Seated NRS Gate Valve with Indicator Post Definition and Components
A Mechanical Joint Resilient Seated ul/fm NRS Gate Valve with Indicator Post (Model 1113) is a buried water valve that can be operated from ground level. It combines a standard mechanical joint valve with an extension stem and protective post.
Main Parts:
Valve body with MJ ends
Resilient-seated gate
Long extension stem
Indicator post (steel pipe)
Ground-level operating nut with position indicator
Protective valve box/cover
Role, Characteristics, and Application Scenarios of Mechanical Joint Resilient Seated NRS Gate Valve with Indicator Post in Pipelines
Fire gate valve Functions:
Buried pipeline isolation
Above-ground operation
Visual position indication
Emergency shutdown access
Operational Features:
No excavation needed
Corrosion protected
Lockable cover option
Full port design
Fire valve Typical Applications:
Underground water mains
Street valve installations
Fire protection systems
Subdivision isolation points
Scenario Diagram:
Mechanical Joint Resilient Seated NRS Gate Valve with Indicator Post Standards: Materials, Design, and Connections
Material Standards:
Body/Gate: ASTM A536 Ductile Iron
Stem: ASTM A276 Stainless Steel
Post: ASTM A53 Galvanized Steel
Seat: EPDM (NSF/61 approved)
Design Standards:
Primary: AWWA C509
Pressure: 150/200 psi standard
Burial: AWWA C550 coating
Connection Standards:
Mechanical Joint: AWWA C111
Pipe Compatibility: AWWA C110/C151
End Type: MJ x MJ (both ends)
How to Select Mechanical Joint Resilient Seated NRS Gate Valve with Indicator Post
Key Steps:
Specify: Size, pressure, post length, burial depth
Verify Standards: AWWA C509 compliance mandatory
Select Supplier: Experienced in buried valve packages
Request Documents: AWWA certs, NSF/61, material reports
Review Drawing: Confirm post length and details
Critical Specifications:
Post length (from valve center to grade)
Valve box type (traffic-rated or standard)
Locking mechanism required
Soil condition for coating selection
Lead Time: Typically 10-16 weeks for custom extensions.
Pre-Shipment Inspection for Export Mechanical Joint Resilient Seated NRS Gate Valve with Indicator Post and Key Considerations
Documentation Check:
AWWA C509 Certificate
NSF/61 Certification
Material Test Reports (ASTM)
Hydrostatic Test Certificates
Physical Inspection:
Dimensional Verification
Post length (match order)
MJ bell dimensions
Face-to-face measurement
Pressure Testing
Shell test: 2× rated pressure
Seat test: 1.1× rated pressure
Zero leakage requirement
Operational Test
Smooth operation through extension
Indicator accuracy (open/shut)
Torque within limits
Coating Inspection
Internal epoxy: 8-12 mils thickness
External protection per spec
No holidays or defects
Export Packaging:
Indicator post must be supported in crate
Operating nut wrapped separately
Valve box packaged individually
VCI bags in valve cavity
Desiccant for humid destinations
Wooden crate with lifting points
Key Precautions:
Long items: Special reinforcement in container
Thread protection: Caps on all exposed threads
Climate: Extra moisture protection for humid regions
Instructions: Include detailed burial/installation guide
Final Documents for Shipment:
Commercial Invoice
Packing List
Bill of Lading
Certificate of Origin
Complete technical file (certs, reports)
Installation Manual