Refinery High-Pressure, High-Temperature Gate Valve (WC9PSB with F22 Bypass)

This product is a highly specialized Pressure Seal Bonnet ( $\text{PSB}$ ) Gate Valve constructed from $\text{WC}9$ (Chromium-Molybdenum Alloy Steel), specifically engineered for severe high-pressure, high-temperature service in Refineries and power generation facilities.

The inclusion of an $\text{F}22$ Bypass and the $\text{PSB}$ design addresses the challenges of operating and maintaining large isolation valves under extreme thermal and pressure conditions.

📋 Key Features and Specifications

Parameter	Detail / Standard
Valve Type	Wedge Gate Valve
Bonnet Type	Pressure Seal Bonnet ( $\text{PSB}$ )
Body Material	$\text{WC}9$ ( $\text{ASTM A}217 \text{Grade WC}9$ )
Bypass Material	$\text{F}22$ (Forged $\text{Cr}-\text{Mo}$ Steel)
Service	High Pressure (HP), High Temperature (HT), Refinery
Pressure Rating	$\text{ASME CL} 900, 1500, 2500$ (Typically used for $>100\,\text{bar}$ )
Temperature Range	Up to $\text{650}^\circ\text{C}$ (Specific to $\text{WC}9$ creep resistance)
Size Range	$\text{2}''$ to $\text{36}''$

⭐ Design and Compliance Standards

Standard Category	Applicable Codes
Valve Design	$\text{API} 600, \text{ASME B} 16.34$
Face-to-Face Length	$\text{ASME B} 16.10$
End Connections	Flange ( $\text{ASME B} 16.5/\text{B} 16.47$ ) or Butt-Weld ( $\text{ASME B} 16.25$ )
Testing Standard	$\text{API} 598$

💡 Core Design Advantages

Pressure Seal Bonnet ( $\text{PSB}$ ):
- High-Pressure Integrity: The $\text{PSB}$ uses internal pressure to create the seal between the body and the bonnet. The seal tightens as the internal pressure increases, making it superior to conventional bolted bonnets in high-pressure steam and high-temperature hydrocarbon services (typically $\text{CL} 900$ and above).
$\text{WC}9$ Chromium-Molybdenum Steel:
- Thermal and Creep Resistance: $\text{WC}9$ is a $2.25\%$ $\text{Cr} - 1\%$ $\text{Mo}$ alloy steel specifically designed for continuous operation at high temperatures (up to $\text{600}^\circ\text{C}$ or more) without losing strength ( $\text{creep}$ resistance), crucial for refinery hydrotreating or cracking units.
$\text{F}22$ Bypass System:
- Ease of Operation: The bypass valve ( $\text{F}22$ material for strength) is installed across the gate valve’s ports. Before opening a large, high-pressure gate valve, the bypass is opened to equalize the pressure across the wedge. This drastically reduces the force (torque) required to lift the wedge, protecting the stem and seat surfaces.
Optimized Flow: As a gate valve, it provides minimal pressure drop when fully open and tight shut-off when fully closed, and is generally resistant to contaminant accumulation.

🛠️ Other Key Features

Stem: $\text{OS}\&\text{Y}$ (Outside Screw and Yoke) for visible position indication.
Wedge: Elastic or Solid wedge with full guidance.
Actuation: Suitable for Bevel Gear Operation (umbrella gear) or automated actuators due to the high operating forces involved.
Seat Rings: Welded-in or replaceable seat rings available, typically hard-faced (e.g., Stellite) for wear resistance.