Description

HIGH PRESSURE / HIGH TEMPERATURE GATE VALVE TECHNICAL DATA SHEET

Project Name: ____________________
Tag No.: ____________________
Quantity: ______ Units

Item	Technical Parameter	Remarks/Notes
Valve Type	Solid Wedge / Flexible Wedge OS&Y Gate Valve	Flexible wedge recommended for high temps to prevent binding
Nominal Size (DN / NPS)	【TBD】 (e.g., DN150 / NPS 6)	Main Valve Size
Pressure Class (Class)	【TBD】 (e.g., Class 2500 / PN420)
End Connection	Butt-Weld (BW)	Per ASME B16.25 or GB/T 12224
Bonnet Type	Pressure Seal	Sealing improves with higher pressure
Operation Method	【TBD】 (Handwheel/Gear/Electric)	Gearbox recommended for large bore/high pressure
Bypass System	With Bypass (Built-in)	Refer to Bypass Specification below
Design Standard	ASME B16.34 / API 600 / GB/T 12234	ASME standards preferred
Pressure-Temperature Rating	ASME B16.34 / ISO 7005-1	Determined by material grade

Item	Technical Parameter	Remarks/Notes
Service Medium	【TBD】 (e.g., HP Steam / Hot Oil / Flue Gas)
Design Pressure (MPa/psi)	【TBD】
Design Temperature (°C/°F)	【TBD】	Typical: ≤425°C (WCB); ≤600°C (Alloy)
Operating Pressure (MPa/psi)	【TBD】
Operating Temperature (°C/°F)	【TBD】
Bypass Function	Equalize pressure across the main valve to reduce opening torque	Prevents stem bending/seat damage under high differential pressure

Part Name	Recommended Material (Temp. Dependent)	Material Standard/Remarks
Body	【TBD】 (WCB / WC6 / WC9 / C12A)	Carbon Steel (≤425°C) Cr-Mo Steel (≤600°C)
Bonnet	【TBD】 (Same as Body)	Pressure Seal Type
Wedge (Gate)	【TBD】 (Same as Body + Hardfacing)	Solid or Flexible Wedge
Seat Ring	【TBD】 (Same as Body + Hardfacing)	Hardfaced with Stellite
Stem	【TBD】 (F6a / F22 / F91 / 17-4PH)	Chrome plated or Nitrided
Pressure Seal Ring	Flexible Graphite + Stainless Steel Wire/Foil	For high temperature service
Packing	Flexible Graphite + Inconel Wire	High temp resistant, anti-extrusion

Item	Technical Parameter	Remarks/Notes
Bypass Structure	Integral Forged Body / External Type	Integral forged type recommended to prevent leakage
Bypass Valve Type	Forged Steel Gate / Globe Valve	Globe Valve recommended for better throttling control
Bypass Nominal Size (DN)	【TBD】 (e.g., DN20 / NPS 3/4″)	Typically 10%-15% of main valve size
Bypass Pressure Class	Same as Main Valve (e.g., Class 2500)	Must match main valve rating
Bypass Connection	Socket Weld (SW) / Butt-Weld (BW)	SW is common for small bore high pressure
Bypass Flow Direction	From upstream to downstream (during equalization)	Must ensure proper pressure balancing

Note: Detailed bevel data must be provided for Butt-Weld ends.

Item	Standard/Requirement	Remarks
Shell Hydrostatic Test	1.5 x Rated Pressure at 38°C	Per API 598 / ISO 5208
High Pressure Seat Test	1.1 x Rated Pressure at 38°C	Bi-directional testing
Low Pressure Pneumatic Test	0.5 – 0.7 MPa	Upon request
Non-Destructive Examination (NDE)	Radiography (RT) on Body/Bonnet / Magnetic Particle (MT)	Mandatory for high pressure/temp
Hardness Test	On hardfacing, studs, etc.

Actuator (if electric): Provide motor data, voltage, and Explosion-proof class (Exd IIBT4 / Exd IICT4).
Yoke: Consider a finned-type yoke for heat dissipation in high-temp applications.
Vent/Drain: Add vent/drain ports on bonnet if the medium is prone to solidification.
Nameplate: Stainless steel, riveted securely.

Material Selection:
- WCB (Carbon Steel): Suitable for -29°C ~ 425°C.
- WC6 (1.25Cr-0.5Mo): Suitable for steam service up to 540°C.
- WC9 (2.25Cr-1Mo): Suitable for steam and hot oil up to 595°C.
- C12A (9Cr-1Mo-V): Suitable for severe service up to 650°C.
Bypass Operation: To operate, open the bypass valve first to equalize pressure across the main gate. This allows the main valve to open easily without high torque. Always close the bypass valve last when shutting down the line.