1″-2500LB-BW Double Block Gate Valve

Nominal Size 1 inch (DN 25) per valve; assembly size based on common inlet/outlet
Pressure Class Class 2500LB (equivalent to PN 420 bar)
End Connections Butt Weld (BW) – inlet and outlet ends
Configuration Two gate valves welded body-to-body
Structure Type Outside Screw & Yoke (OS&Y), solid wedge or flexible wedge (per service)
Operation Each valve independently operated (handwheels or gear operators as required)

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Technical Data Sheet

Product: Double Block Gate Valve
Model / Size: 1″ – 2500LB – BW
إعدادات: Two high-pressure forged steel gate valves welded into a single integrated body assembly

Product Description

This valve consists of two forged steel gate valves welded together to form a compact, single-unit double block isolation assembly. The double block configuration provides two independent sealing barriers, ensuring positive isolation even in the event of a single seal failure. This assembly is ideal for critical applications such as high-pressure steam, hydrogen, hydrocarbon, and chemical services where absolute shut-off, safety, and system integrity are paramount. Each valve operates independently, allowing for cavity pressure monitoring, testing, or venting between the two blocks. All connections are butt weld (BW) ends, ensuring leak-free, permanent piping integration.

Basic Parameters

Item	المعلمة
الحجم الاسمي	1 inch (DN 25) per valve; assembly size based on common inlet/outlet
Pressure Class	Class 2500LB (equivalent to PN 420 bar)
End Connections	Butt Weld (BW) – inlet and outlet ends
Configuration	Two gate valves welded body-to-body
Structure Type	Outside Screw & Yoke (OS&Y), solid wedge or flexible wedge (per service)
عملية	Each valve independently operated (handwheels or gear operators as required)

معايير التصميم

Item	معيار
Design & Manufacture	API 602 (Compact steel gate, globe, and check valves) – applicable for individual valve design; assembly per manufacturer’s standard
Pressure-Temperature Rating	ASME B16.34
Butt Weld End Dimensions	ASME B16.25 (bevel ends)
Face-to-Face Dimensions	Manufacturer’s standard (assembly length)
Inspection & Testing	API 598 (or ISO 5208); double block isolation tested per API 6D or customer specification
Welding (Body-to-Body)	Per ASME Section IX; 100% NDE of weld

Bill of Materials (Typical Configuration)

Part Name	Material (Typical Options)	ملاحظات
Valve Bodies (x2)	A105 (carbon steel) / A182 F22 (Cr-Mo) / A182 F316 (stainless steel)	Forged steel; welded together to form integral assembly
Wedge (x2)	A105 + 13Cr / F22 + Stellite / F316	Solid or flexible wedge; hardfaced seating surfaces
Seat Rings (x2)	Integral body seat with hardfacing	Stellite 6 overlay for wear and erosion resistance
Stem (x2)	A182 F6a (13Cr) / A182 F304 / A182 F316	Precipitation hardened or austenitic stainless steel
Bonnet (x2)	Same material as body	Bolted bonnet with spiral-wound gasket
Packing (x2)	Flexible graphite with anti-extrusion rings	Low-emission packing system
Handwheel / Operator (x2)	Carbon steel / Ductile iron / Gear operator (optional)	Independent operation
Butt Weld Ends	Bevel ends per ASME B16.25	Inlet and outlet

Dimensions & Weight (Reference)

Item	Value
Overall Length (End-to-End)	Approx. 300 ~ 400 mm (manufacturer dependent)
Overall Height	Approx. 400 ~ 500 mm (including handwheels or operators)
Butt Weld End	1″ Schedule XXS or appropriate wall thickness for 2500LB
Handwheel Diameter (each)	Approx. 150 ~ 200 mm (or larger if gear operated)
Approx. Weight	35 ~ 55 kg (depending on material and operator type)

Note: Dimensions and weights are typical values for welded double block gate valve assemblies and may vary by manufacturer.

Operating Conditions

Item	المعلمة
Suitable Media	High-pressure steam, hydrogen, hydrocarbons, corrosive fluids, high-temperature liquids/gases
Temperature Range (Carbon Steel)	-29°C ~ 425°C
Temperature Range (Alloy Steel F22)	-29°C ~ 538°C
Temperature Range (Stainless Steel)	-196°C ~ 538°C
Max. Allowable Pressure	Approx. 42.0 MPa (420 bar) at ambient temperature (38°C)

Testing & Inspection

Test	Requirement
Shell Strength Test (each valve)	1.5 times rated pressure (hydrostatic); no leakage
High-Pressure Seat Test (each valve)	1.1 times rated pressure; zero visible leakage
Low-Pressure Pneumatic Test (each valve)	0.6 MPa compressed air; seat leakage within allowable limits (typically zero for gate valves)
Double Block Isolation Test	Both valves closed; pressure applied between blocks; no pressure rise or leakage observed (per API 6D or customer requirement)
Body-to-Body Weld Examination	100% radiographic testing (RT) or ultrasonic testing (UT) per ASME Section VIII
Operational Test	Full stroke cycling of each valve under rated differential pressure

Features & Benefits

Double Block Isolation: Two independent gate valves in a single welded assembly provide redundant shut-off capability, ensuring absolute isolation for critical systems.
Compact, Leak-Free Design: Welded integration eliminates external flange connections between valves, reducing potential leak paths and installation space.
High-Pressure Capability: Class 2500 rating with forged steel construction ensures reliability in ultra-high-pressure applications.
Permanent Butt Weld Ends: BW connections provide a leak-free, permanent installation ideal for critical and hazardous services.
Cavity Monitoring Capability: The space between the two blocks allows for pressure monitoring, venting, or testing without disturbing system operation.
Fugitive Emission Compliance: Stem packing systems can be designed to meet ISO 15848 or TA-Luft low-emission requirements.
Flexible Wedge Option: For high-temperature applications, flexible wedge design accommodates thermal expansion and prevents binding.

Important Notes

Operation Sequence: When used as a double block assembly, typically the upstream valve is opened first and closed last to protect the downstream valve from full system pressure and flow-induced wear.
Cavity Pressure Relief: A bleed or vent port (optional) should be considered to relieve trapped pressure between the two blocks before maintenance or disassembly downstream.
Butt Weld Installation: Welding must be performed per approved Welding Procedure Specification (WPS) with appropriate post-weld heat treatment (PWHT) when required by material and wall thickness.
اتجاه التدفق: Gate valves are bidirectional; no specific flow orientation is required unless otherwise specified by manufacturer.
Thermal Expansion: Allow for thermal expansion of piping system; installation should consider proper support and anchoring.
NDE Requirements: Body-to-body weld requires 100% NDE; ensure this is performed and documented as part of quality control.

If you require additional specifications such as NACE MR0175 for sour service, gear operators for high-torque applications, or fugitive emission testing documentation, please let me know and I can supplement the data sheet accordingly.

ضمان:

تلتزم شركة سافي فالفز بتقديم منتجات عالية الجودة وخدمة ما بعد البيع مريحة. نضمن لصماماتنا عمر خدمة لا يقل عن ١٢ شهرًا، نوفر خلالها جميع قطع الغيار اللازمة وتعليمات الصيانة المفصلة مجانًا. خلال فترة الضمان، في حال حدوث أي ضرر غير بشري، نستبدل المكونات مجانًا ونقدم دعمًا فنيًا احترافيًا. بعد انتهاء الضمان، يدفع العميل فقط تكلفة قطع الغيار، مع الاستفادة من خدمات الصيانة المخفضة. هدفنا هو مساعدة عملائنا على خفض تكاليف التشغيل وتحسين كفاءة الإنتاج من خلال جودة موثوقة ودعم شامل لما بعد البيع. سواءً للاستفسارات الفنية أو احتياجات الصيانة، سيستجيب فريق خبرائنا على الفور لضمان الحفاظ على الأداء الأمثل لنظام صماماتك في جميع الأوقات.

منتجات البيع الساخنة

منذ أكثر من 10 سنوات، كنا المورد الرائد للصمامات الصناعية للمشاريع العالمية الكبرى في إمدادات المياه والنفط والغاز وتحلية المياه.