2″-1500LB-RTJ Piston Pneumatic Globe Valve

Size 2″ (DN50)
Pressure Class Class 1500 (PN250)
Design Type Globe Valve (Bolted Bonnet)
End Connections Flanged RTJ (Ring Type Joint)
Flange Standard ASME B16.5
Sealing Face RTJ, suitable for R23 / R24 ring gaskets
Temperature Range -29°C ~ +425°C (depending on seating material)
Media High pressure steam, high pressure gas, oil, water, corrosive fluids

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2″-1500LB-RTJ Piston Pneumatic Globe Valve

Technical Data Sheet

Product: Pneumatic Piston Globe Valve
Size / Rating: 2″ – Class 1500 – RTJ (Ring Type Joint)
Actuator Type: Pneumatic Piston Actuator

General Description

This high‑pressure pneumatic globe valve is driven by a piston‑type actuator, designed for Class 1500 service. The RTJ (Ring Type Joint) flanged ends ensure reliable sealing under extreme pressures using metal ring gaskets. The piston actuator delivers high output torque and fast response, making it ideal for remote automatic control or emergency shutdown applications in oil & gas, petrochemical, power generation, and refining industries.

Basic Specifications

매개변수	사양
크기	2″ (DN50)
Pressure Class	Class 1500 (PN250)
Design Type	Globe Valve (Bolted Bonnet)
End Connections	Flanged RTJ (Ring Type Joint)
Flange Standard	ASME B16.5
Sealing Face	RTJ, suitable for R23 / R24 ring gaskets
온도 범위	-29°C ~ +425°C (depending on seating material)
메디아	High‑pressure steam, high‑pressure gas, oil, water, corrosive fluids

Material Specification

No.	Part Name	Standard Material	Upgrade Option
1	몸	A105 (CS) / F316 (SS)	F22 (Alloy Steel) / F51 (Duplex)
2	Bonnet	A105 (CS) / F316 (SS)	Same as body
3	디스크	2Cr13 / 304 SS + Stellite hardfacing	316L + Stellite / Monel
4	좌석	Integral Stellite overlay on body	Replaceable seat + hardfacing
5	줄기	17-4PH / 2Cr13	Inconel 718 / 316L
6	Packing	Flexible Graphite + anti‑extrusion rings	Low emission packing set
7	Stem Nut	Aluminum Bronze	Stainless Steel + anti‑galling coating
8	Body Gasket	Spiral Wound (with inner/outer rings)	Metal Serrated / Lens Ring
9	Actuator	Pneumatic Piston Actuator	Double Acting / Spring Return (see Section 5)

RTJ Flange Sealing Features

4.1 Preferred Sealing for High Pressure

RTJ sealing principle – Metal ring gasket is compressed into the flange groove, creating a metal‑to‑metal line contact seal. Ring materials include soft iron, 304/316 SS, or Inconel.
High‑pressure capability – RTJ joints are specifically designed for Class 600 and above, maintaining reliable sealing under temperature fluctuations and pressure surges.
Easy maintenance – Ring gaskets can be reused if undamaged and are simple to replace.

4.2 Ring Gasket Specifications

Flange Size	Ring Number	Ring Material
2″ Class 1500	R23 / R24	Soft Iron / 304 SS / 316 SS / Inconel

Ring type and material to be confirmed based on flange standard and service conditions.

Pneumatic Piston Actuator Specifications

5.1 Actuator Basic Parameters

매개변수	설명
Type	Pneumatic Piston Actuator
Action	Double Acting / Spring Return (optional)
Supply Pressure	4 ~ 8 bar (standard 5.5 bar)
Output Torque	Selected based on valve torque requirements, typically ≥ 1.3 safety factor
Operating Temperature	-20°C ~ +80°C (standard) / -40°C ~ +120°C (optional)
Cylinder Material	Aluminum (anodized) / Carbon Steel / Stainless Steel
Seals	NBR / FKM / PTFE (based on temperature & media)

5.2 Actuator Accessories (Optional)

Accessory	Function
Solenoid Valve	Controls air supply for remote on/off control (single/dual coil, explosion‑proof optional)
Limit Switch	Provides open/close position feedback (mechanical / inductive, explosion‑proof optional)
Positioner	Enables precise valve positioning with 4-20mA input signal
Air Filter Regulator Lubricator	Ensures clean, stable air supply
Manual Override	Allows manual operation during air supply failure
Quick Exhaust Valve	Increases closing speed for emergency shutdown applications
Lock‑up Valve	Holds valve position upon air supply failure

5.3 Actuator to Valve Connection

Mounting standard – ISO 5211 top flange (F10 / F12 / F14, etc., based on torque)
Connection method – Bracket + coupling to ensure concentricity and reliable torque transmission

주요 특징

6.1 High‑Pressure Globe Valve Characteristics

Reliable high‑pressure sealing – Disc and seat are hardfaced with Stellite for high hardness, wear resistance, and erosion resistance under high differential pressure.
Flow under the disc – Media enters below the disc, ensuring tight shut‑off as pressure assists sealing.
Blowout‑proof stem – Stem design prevents ejection under pressure.

6.2 Pneumatic Actuator Advantages

High output torque – Piston design provides greater torque than diaphragm actuators, suitable for high‑pressure valve operation.
Fast response – Pneumatic actuation offers quick opening/closing for emergency shutdown and frequent cycling.
Fail‑safe capability – Spring return actuators automatically return to a safe position (open or closed) upon air supply failure.

6.3 Overall Reliability

Low emission – Packing meets ISO 15848 fugitive emission standards.
Fire safe – Optional API 607 construction for flammable media.

Testing & Standards

Test / Standard	Reference
Design & Manufacture	ASME B16.34 / BS 1873
Flange Standard	ASME B16.5 (RTJ)
Pressure Testing	API 598
Shell Test	1.5 × Class 1500 (37.5 MPa)
Seat Leakage Test	1.1 × Class 1500 (27.5 MPa)
Fugitive Emission (optional)	ISO 15848‑1 / TA‑Luft
Fire Safe (optional)	API 607 / ISO 10497
Actuator Standards	VDI / VDE 3845, NAMUR

Installation & Maintenance Notes

8.1 Installation Precautions

Flow direction – Install according to the flow arrow on the body (flow under the disc).
RTJ flange installation:

Inspect flange grooves and ring gasket surfaces for scratches or debris before installation
Ensure the ring gasket is properly seated in the groove
Tighten bolts evenly in a cross pattern to the specified torque

Air supply – Ensure clean, dry air supply; install an air filter regulator lubricator upstream.

8.2 Commissioning & Operation

Initial status – Verify the valve is in a safe position before applying air pressure.
Speed control – Adjust opening/closing speed with flow control valves if needed.
Limit switch adjustment – Ensure position feedback signals correspond to fully open/fully closed positions.

8.3 Maintenance

Regular inspection – Check air supply pressure, air line sealing, and actuator operation.
Packing adjustment – If slight leakage occurs at the packing, carefully tighten the packing gland.
Ring gasket replacement – When disassembling RTJ flanges, inspect the ring gasket for damage and replace if necessary.

Approximate Dimensions (for reference)

Dimension	Value (mm / inch)
Face‑to‑Face Length (L)	~368 mm (14.5″)
Flange Outer Diameter	Per ASME B16.5 Class 1500
Flange Bolt Circle	Per ASME B16.5 Class 1500
RTJ Groove Dimensions	Per ASME B16.5
Overall Height (with actuator)	~800 ~ 1000 mm (depending on actuator model)
Actuator Interface	ISO 5211 F10 / F12 / F14 (torque‑dependent)

Note: Final dimensions are subject to the specific design; certified GA drawings should be referenced for engineering purposes.

Remarks:

This valve is designed for high‑pressure applications. Installation and commissioning should be performed by qualified personnel.
Actuator sizing should be based on actual valve torque, supply pressure, and fail‑safe requirements. Consult the engineering department for selection.
For explosion‑proof solenoid valves, limit switches, or other accessories, please specify the required hazardous area classification.

보증:

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