Description

ESD Floating Ball Valve – Technical Data Sheet

1. Product Overview

The ESD (Emergency Shutdown) Floating Ball Valve is a critical safety device designed for instant isolation of pipelines during emergency conditions. This valve features a floating ball design where the ball is displaced under medium pressure to seal against the downstream seat, ensuring bubble-tight shut-off. Equipped with a single-acting pneumatic actuator with spring return, the valve provides fail-safe operation – automatically closing upon loss of air supply or detection of abnormal conditions such as overpressure, fire, or system failure.

2. Valve Specifications

Parameter	Specification
Valve Type	Floating Ball Valve – ESD (Emergency Shutdown)
Nominal Size	1/2″ (DN15)
Pressure Rating	Class 2500 LB (PN420)
End Connection	BSPP (British Standard Pipe Parallel) female threaded
Operation	Single-acting pneumatic actuator, spring return (fail-safe)
Body Material	ASTM A350 LF2 (Low-Temperature Carbon Steel)
Trim Material	F51 Duplex Stainless Steel (ASTM A182 F51 / UNS S31803)
Seat Material	PEEK (Polyether Ether Ketone)
Design Standard	API 608 / API 6D / ASME B16.34
Fire-Safe Design	API 607 / API 6FA

3. Technical Parameters

3.1 Pressure-Temperature Ratings

Parameter	Value
Nominal Pressure	Class 2500 LB (PN420)
Shell Test Pressure	1.5 × rated pressure
Seal Test Pressure	1.1 × rated pressure
Low-Pressure Seal Test	0.6 MPa

3.2 Temperature Range

Component	Temperature Range
Body (LF2)	-46°C to +200°C
PEEK Seat	-100°C to +260°C (continuous use)
Valve Assembly	-29°C to +180°C (typical)

Note: PEEK has a melting point of 334°C and glass transition temperature of 143°C; 30% glass or carbon fibre reinforced PEEK can withstand up to 316°C.

3.3 Flow Characteristics

Parameter	Value
Valve Action	Quarter-turn (90° rotation)
Flow Pattern	Full bore or reduced bore (as specified)
Flow Resistance	Minimum (lowest of all valve types)
Shut-off	Bubble-tight, bi-directional sealing

4. Materials of Construction

4.1 Standard Material Configuration

Part	Material	Specification
Body	Low-Temperature Carbon Steel	ASTM A350 LF2
Ball	Duplex Stainless Steel	ASTM A182 F51 (UNS S31803)
Stem	Duplex Stainless Steel	ASTM A182 F51
Seat	PEEK (Polyether Ether Ketone)	Soft seat
Seals / Packing	PTFE / Graphite	As per design

4.2 Material Properties

ASTM A350 LF2 (Body):

Forged low-temperature carbon steel
Excellent impact toughness at low temperatures
Widely used for low-temperature and high-pressure services

ASTM A182 F51 (Trim – Ball & Stem):

Duplex stainless steel (UNS S31803)
Mixed microstructure of austenite and ferrite
Superior strength over ferritic and austenitic grades
Excellent corrosion resistance

PEEK (Seat):

High-performance engineering thermoplastic
Continuous use temperature: 260°C
Excellent chemical resistance
High mechanical strength and wear resistance
Suitable for high-pressure applications up to Class 2500 LB

5. Actuator Specifications

5.1 Pneumatic Actuator – Single Acting, Spring Return

Parameter	Specification
Actuator Type	Single-acting pneumatic actuator
Fail-Safe Mode	Spring return (fail-close or fail-open as configured)
Operation	Air pressure moves ball to one position; spring returns upon air loss
Supply Pressure	As per actuator sizing (typically 4–8 bar)
Mounting	ISO 5211 top flange
Accessories	Limit switches, solenoid valve, positioner (optional)

5.2 Actuator Operating Principle

Single-acting (Spring Return): Compressed air is required to operate the valve in one direction. Upon loss of air pressure, the stored energy in the springs forces the piston to return the valve to its fail-safe position.
ESD Function: Supports remote ESD signals (hardwired/wireless), accepting commands from station control systems or leak detection systems for emergency safety shutdown.

6. Design Features

Feature	Description
Floating Ball Design	Ball is displaced by medium pressure against downstream seat for positive sealing
Fire-Safe Design	Complies with API 607 / API 6FA
Anti-Static Device	Stem-to-ball and stem-to-body anti-static spring
Blow-Out Proof Stem	T-shaped lower end prevents stem ejection under pressure
Low Emission Design	Live-loaded stem packing for fugitive emission control
ISO Mounting Pad	ISO 5211 top flange for easy actuator mounting
Locking Device	Optional locking device available
Bi-Directional Seal	Seals in both flow directions

7. Applicable Standards

Standard	Description
API 608	Metal Ball Valves – Flanged, Threaded, and Welding Ends
API 6D	Pipeline and Piping Valves
ASME B16.34	Valves – Flanged, Threaded, and Welding End
ASME B16.10	Face-to-Face and End-to-End Dimensions
ASME B16.5	Pipe Flanges and Flanged Fittings
API 607 / API 6FA	Fire Test for Soft-Seated Quarter-Turn Valves
API 598	Valve Inspection and Testing
ISO 15848	Fugitive Emissions (optional)

8. Inspection & Testing

Test	Standard
Shell Strength Test	1.5 × rated pressure
High-Pressure Seal Test	1.1 × rated pressure
Low-Pressure Seal Test	0.6 MPa
Fire-Safe Test	API 607 / API 6FA
Fugitive Emission Test	ISO 15848 (optional)

9. Application & Service Conditions

Parameter	Specification
Primary Function	Emergency Shutdown (ESD) / Safety isolation
Typical Applications	Oil & gas pipelines, petrochemical, chemical, power plants, offshore platforms
Service Media	Natural gas, oil, petrochemicals, water, corrosive media (acids, alkalis)
Actuation Mode	Pneumatic – single acting with spring return

10. Ordering Information

When ordering, please specify:

Item	Specification
Valve Type	ESD Floating Ball Valve
Size	1/2″
Pressure Rating	Class 2500 LB
End Connection	BSPP female thread
Body Material	ASTM A350 LF2
Trim Material	ASTM A182 F51
Seat Material	PEEK
Actuator	Single-acting pneumatic, spring return
Accessories	As required (limit switches, solenoid valve, etc.)
Special Requirements	Fire-safe, anti-static, low emission, etc.

ESD Floating Ball Valve-1/2″ 2500LB BSPP