Description

Trunnion Mounted V-Port Control Ball Valve — Product Technical Data Sheet

Product Name: Trunnion Mounted V-Port Control Ball Valve

Model Series: VQ640H-T / ZSHV-T / VQ947H-T / V Series – Trunnion Type

1. Product Overview

The trunnion mounted V-port control ball valve is a quarter-turn rotary control valve featuring a trunnion-supported ball design. The ball is fixed on upper and lower stems with bearing supports, providing excellent stability, low operating torque, and high pressure bearing capacity. The V-notch on the ball offers an inherent flow characteristic close to equal percentage and a rangeability up to 300:1.

This design is ideal for large bore sizes, high differential pressure, high cycle operation, and demanding services including abrasive, viscous, or fibrous media. The trunnion construction eliminates ball deflection under pressure, ensuring long-term sealing integrity and precise control.

2. Trunnion Mounted Design Features

Fixed ball with upper/lower stem support – Ball position is fixed, preventing downstream shift under high pressure.
Anti-blowout stem – Stem retained by anti-static bearings.
Low operating torque – Bearings reduce friction, allowing smaller actuators.
High pressure capability – Suitable for Class 600 to Class 1500 and higher.
Double piston effect (DPE) seat – Optional bidirectional sealing at full pressure rating.

3. Design Standards & Specifications

Same as standard V-port ball valve (see previous sheet), with additional compliance for high-pressure trunnion designs:

Item	Standard
Design	API 6D, ASME B16.34, ISO 14313
Fire Safe	API 607 / API 6FA
NACE	MR0175 / MR0103
Actuator mounting	ISO 5211

4. Main Technical Parameters (Trunnion Type)

Parameter	Range
Nominal Diameter (DN)	DN50 ~ DN1200 (NPS 2″ ~ 48″)
Nominal Pressure (PN)	PN16 ~ PN420 (Class 150 ~ Class 2500)
ASME Class	150, 300, 600, 900, 1500, 2500
Connection Type	Flanged (RF/RTJ), Butt weld
Ball Rotation	0° ~ 90° (adjustable)
Flow Characteristic	Approx. equal percentage / linear
Rangeability	250:1 ~ 300:1
Seat Leakage (Soft)	Zero / Class VI
Seat Leakage (Metal)	Class IV ~ V (optional Class VI for metal)
Operating Torque	30% ~ 50% lower than floating ball design

5. Rated Flow Coefficient (Cv) – Example for Trunnion Type

DN (mm)	100	150	200	250	300	350	400	450	500	600	750	900	1050	1200
Rated Cv	360	1120	1850	2950	3700	7195	11466	15500	21000	32500	48000	68000	88000	115000

Cv values are typical and vary by V-port profile.

6. Material Specifications (Trunnion Specific)

Component	Standard Material	High Performance Option
Body / Bonnet	WCB, LCB, CF8, CF8M, CF3M	Duplex, Inconel, Monel
Ball (V-port)	17-4PH, F304, F316	Hard chrome plated, Stellite, Tungsten carbide coating
Trunnion bearings	PTFE + glass fiber / Nylon 6 / Metal-backed PTFE	Reinforced PEEK, Carbon graphite
Stem	17-4PH, F316	Inconel 718
Seat rings (trunnion)	Spring-loaded floating seat with PEEK / PTFE / Metal seal	Double piston effect (DPE) seat

7. Seat & Sealing Configurations for Trunnion

Seat Type	Leakage Class	Application
Soft seat (PTFE / PEEK)	Zero / Class VI	Clean or moderate solids, tight shut-off
Metal seat (Stellite)	Class IV / V	High temp, abrasive, high cycle
Double piston effect (DPE)	Bi-directional zero leakage	High pressure, bidirectional flow

The trunnion design allows independent upstream/downstream sealing with spring-energized seats, ensuring reliable shut-off even under large pressure fluctuations.

8. Advantages of Trunnion Mounted V-Port Valve

Low torque – Ball supported by bearings reduces actuator size and cost.
High pressure capability – No ball deflection; suitable for Class 900 and above.
Bidirectional sealing available – DPE seats provide tight shut-off in both directions.
Suitable for high cycle life – Bearings reduce wear, extending cycle life > 10x compared to floating ball in demanding services.
V-notch self-cleaning – Same shearing action as standard V-port, ideal for fibers and slurries.
Easy automation – ISO 5211 mounting pad, direct coupling to pneumatic/electric actuators.

9. Typical Applications for Trunnion Mounted V-Port

Oil & Gas – Pipeline control, high pressure gas/liquid, crude oil blending
Petrochemical – High DP reactor feed, catalyst slurry, heavy oil coking
Power – Boiler feedwater bypass, high pressure steam attemperation, coal slurry
Mining – High pressure tailings, mineral slurry, abrasive sand
Water & Wastewater – Large diameter raw water, desalination, flood control

10. Actuator Selection for Trunnion Type

Due to lower torque, a smaller actuator can be used compared to floating ball design. However, dynamic torque must be considered at high DP.

Actuator Type	Sizing Note
Pneumatic (rack & pinion or scotch yoke)	Break torque = seat + bearing friction + dynamic torque
Electric (modulating or on-off)	Use safety factor 1.3~1.5 for sticky media

11. Ordering Information

Please specify for trunnion mounted V-port valve:

DN / NPS & pressure class
Media, temp, viscosity, solids content
Max. differential pressure (ΔP) across valve
Required shut-off class (soft / metal / DPE)
Flow characteristic (equal % / linear)
Actuator type & control signal
NACE / fire safe / SIL requirement

This technical data sheet applies specifically to trunnion mounted V-port control ball valves. For floating ball version, please refer to the standard V-port data sheet.

V-Port Control Ball Valve Ready For Actuator