Open Die-Forged Gate Valve （PSB）

Nominal Size (NPS) 1/2″ ~ 2″ (DN15 ~ DN50)
Pressure Class Class 1500 / Class 2500 / Class 4500 (Custom)
Connection Type Butt-Weld Ends (BW) conforming to ASME B16.25 Temperature Range -29°C ~ +550°C (-20°F ~ +1022°F) Applicable Media High-pressure steam, Hot water, Oil & Gas, Power generation applications
Design Standard API 602 / ASME B16.34 / ISO 15761

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설명

Forged Steel Gate Valve Technical Data Sheet

(Free Forging Process / Welded Connection / ASTM A182 F11 Body / Pressure Self-Sealing Bonnet)

Product Name: Forged Steel Pressure Self-Sealing Bonnet Gate Valve (Welded Ends)

Product Overview

This valve features a free forging process for the body, ensuring superior grain structure and mechanical properties compared to castings. It is designed with a pressure self-sealing bonnet (pressure seal design) , where the sealing performance increases with internal pressure, making it ideal for high-pressure and high-temperature applications. The body material is ASTM A182 F11 (1.25% Chrome – 0.5% Molybdenum alloy steel) , offering excellent creep resistance and high-temperature strength. Connections are butt-weld ends (BW) per ASME B16.25, providing leak-free piping systems. Designed in accordance with API 602 그리고 ASME B16.34.

General Technical Specifications

Item	사양
밸브 유형	Bolted Bonnet, Outside Screw and Yoke (OS&Y), Rising Stem Gate Valve
Manufacturing Process	Free Forging (Hot forged, solution annealed and grain refined)
Bonnet Design	Pressure Self-Sealing (Pressure Seal) – Threaded bonnet ring with sealing gasket
Nominal Size (NPS)	1/2″ ~ 2″ (DN15 ~ DN50)
Pressure Class	Class 1500 / Class 2500 / Class 4500 (Custom)
Connection Type	Butt-Weld Ends (BW) conforming to ASME B16.25
온도 범위	-29°C ~ +550°C (-20°F ~ +1022°F)
Applicable Media	High-pressure steam, Hot water, Oil & Gas, Power generation applications
Design Standard	API 602 / ASME B16.34 / ISO 15761
Face-to-Face Dimension	ASME B16.10 / API 602
Pressure Testing	API 598

Material of Parts Specification

Part Name	Material / Grade	Material Properties & Application
몸	ASTM A182 F11 (Class 2)	1.25%Cr-0.5%Mo alloy steel. High tensile strength, excellent corrosion resistance and creep resistance at elevated temperatures. Suitable for high-pressure steam services .
Bonnet	ASTM A182 F11	Same material as body, ensures consistent thermal expansion and strength .
Disc (Gate)	ASTM A182 F6a (13% Cr) + Stellite Hardfacing / A182 F11	13% Chrome stainless steel with Stellite 6 hardfacing on sealing surfaces for erosion and wear resistance .
Seat Ring	Integral with Body or Welded + Stellite Hardfacing	Hardfaced with Stellite alloy, ground to mirror finish for metal-to-metal tight shut-off .
줄기	ASTM A182 F6a (13% Cr Stainless Steel) / A182 F304	High strength, corrosion resistant, blow-out proof design. Surface treated (nitriding/chrome plating) to reduce friction .
Self-Sealing Gasket	Stainless Steel + Flexible Graphite laminated / Pressure Seal Ring	“Delta” or “Wedge” type ring. Pressure energizes the seal – higher pressure, tighter seal .
Bonnet Ring	ASTM A182 F11 / Carbon Steel	Threaded ring that compresses the self-seal gasket.
Packing	Flexible Graphite (Die-formed rings)	High temperature resistance, low fugitive emission compliance (ISO 15848-1) .
Gland Follower	ASTM A182 F11 / Stainless Steel	Precise compression of packing rings.
Stem Nut	Aluminum Bronze (C95400) / Ni-Resist	Self-lubricating, prevents stem galling .
Handwheel	연성 주철 / Fabricated Steel	Impact-resistant design.

Pressure Self-Sealing Bonnet (Pressure Seal) Characteristics

Principle of Operation: The self-sealing bonnet utilizes a sealing gasket (typically stainless steel/graphite laminate or solid metal “pressure seal” ring) . The bonnet is secured by a threaded bonnet ring. When internal pressure is applied, it forces the bonnet upward, compressing the gasket radially against the body bore. The higher the internal pressure, the tighter the seal .
Advantages for High Pressure:

Eliminates large, heavy flanges and numerous stud bolts required for high-pressure ratings.
Provides a positive, leak-proof seal that is self-energizing.
Reduces weight and envelope size compared to bolted bonnet designs.
Ideal for cyclic temperature and pressure services.

Sealing Gasket: Typically flexible graphite laminated with stainless steel for high-temperature resilience and chemical resistance .

Main Technical Characteristics

Free Forged Body: The forging process refines the grain structure of the A182 F11 alloy, eliminating porosity and providing superior strength and integrity compared to castings. Essential for high-pressure applications .
Pressure Self-Sealing Bonnet: As described in Section 4, this design ensures leak-proof operation under extreme pressures. The bonnet is easily removable for maintenance .
Welded Connection (BW Ends): Butt-weld ends per ASME B16.25 provide a permanent, leak-free connection to the piping system, eliminating flange gasket maintenance and potential leak paths .
A182 F11 Alloy Steel Construction: 1.25% Chrome – 0.5% Molybdenum steel offers excellent resistance to high-temperature creep, oxidation, and corrosion in steam, oil, and gas services up to 550°C .
Hard-Faced Seats (Stellite): The wedge and seat sealing surfaces are overlaid with Stellite (Cobalt-based alloy) , ensuring long life in erosive high-velocity services .
Rising Stem & OS&Y: Clear visual indication of valve position. Outside screw design prevents thread contact with the line media .
Backseat Design: Allows for repacking under pressure when the valve is fully open .
API 602 Compliance: Designed to the rigorous requirements of API 602 for forged steel valves, ensuring robust construction and reliable performance .

Principal Dimensions & Connection Data (Reference Class 1500 BW)

*Note: Final dimensions subject to approval drawings. Conforms to API 602 / ASME B16.10.*

NPS	Size (inch)	Face-to-Face L (mm)	Body Bore (mm)	BW End OD (mm)	Approx. Height H (Open) (mm)	Approx. Weight (kg)
1/2″	0.5	79	12.7	21.8	~158	~2.1
3/4″	0.75	92	19.1	27.2	~169	~2.3
1″	1.0	111	24.0	34.0	~197	~4.3
1-1/4″	1.25	120	31.8	42.8	~236	~5.9
1-1/2″	1.5	140	38.1	48.8	~283	~11.1
2″	2.0	178	50.8	61.4	~330	~15.2

Note: For Class 2500, dimensions vary. Please consult factory for specific drawings .

Applicable Standards & Testing

Design & Manufacture: API 602 (Steel Gate Valves) / ASME B16.34 / ISO 15761 .
본체 소재: ASTM A182 F11 (Chrome-Moly Alloy Steel) .
Bonnet Design: Pressure Self-Sealing Type (Pressure Seal) .
End Connections: ASME B16.25 (Butt-Weld Ends) .
대면: ASME B16.10 / API 602 .
Pressure Tests:

Shell Test: 1.5 x Rated Pressure at ambient temperature
High-Pressure Seat Test: 1.1 x Rated Pressure at ambient temperature
Low-Pressure Pneumatic Test: 0.6 MPa (90 psi)
Inspection Standard: API 598 / API 6D .

비고

This valve is specifically designed for High-Pressure Steam, Power Generation, and Critical Hydrocarbon Services.
그만큼 Pressure Self-Sealing Bonnet combined with A182 F11 Forged Body makes this valve ideal for superheated steam applications up to 550°C .
Stellite hardfacing on seat and disc ensures long-term reliability in erosive conditions .
Butt-weld ends eliminate potential flange leakage and reduce maintenance.
Optional NACE MR0175 / ISO 15156 compliance for sour gas service available upon request.

보증:

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