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Engineering Specifications of Floating Ball Valves

The engineering specifications of Metals Valve’s floating ball valve series includes the selection of seat & sealing materials’ selection, flow coefficient, as well as its torque values. Metals Valve supplies soft seated floating type ball valves in cast steel, forged steel and stainless steel materials.

aluminium-bronze-floating-ball-valve

Aluminium bronze ball valve, floating type, 4″ 150LB, PTFE soft seat, lever operated. Body & Trim: UNS C95800.

1. Seat material selection of floating ball valves(soft seated).

pressure-temperature ratings of seating ans sealing materials

The pressure-temperature ratings of seating and sealing materials including PTFE, Nylon, PEEK, BUNA, Viton and HSN.

PropertiesPTFENYLONPEEKPCTFEDEVLON
Temperature ℉-328~428-58~248-148~500-328~302-148~302
Temperature ℃-200~220-50~120-100~260-200~150-100~150
Pressure Ratings(LB)150~600150~1500150~2500150~1500150~1500
Hardness5872888578
Tensile Strength(MPa)14~3455.213435.979.9
Yield Strength(MPa)3502502.21505.4
Specific Gravity(g/cm3)2.171.021.442.121.14
Water Absorption(24hr %)0.001.000.060.000.10
Water Saturation<0.011.600.20<0.013.00
Different soft seating materials can be respectively chosen in terms of specific applications: PTFE mainly for chemical & cryogenic service, NYLON for high pressure & hydrocarbon service, PEEK for high pressure & high temperature service, PCTFE for cryogenic service, DEVLON for high pressure & hydrocarbon applications.

2. Sealing materials selection

PropertiesNBRHNBRVITONFFKMEPDM
Temperature ℉-22~230-40~302-4~392-4~620-58~302
Temperature ℃-30~110-40~150-20~200-20~327-50~150
Specific Density(g/cm3)1.311.341.852.000.87
Hardness(shore A)7575757575
Generally, all body/ bonnet seals are furnished in graphite. The sealing materials listed within this table are mainly used for stem and seat O-rings.

3. Flow Coefficient(Cv) and Operating Torque of floating ball valves

Flow Coefficient

Size150LB300LB600LB900LB1500LB
1/2"2525201616
3/4"5656483434
1"9595645555
1-1/2"308308308165165
2"500430370320320
3"136011001020920-
4"250020001850--
6"53005250---
8"1075010100---
10"1750016820---
12"2675025950---
The flow coefficient Cv of the floating ball valve denoting flow rate of water(gallons/minutes):
(1) All sizes are in full port and fully open position.
(2) Pressure ratings shall be in accordance with ASME B16.34.

Operating Torque 01

Operating Torque 02

CATEGORY AND TAGS:

Technical

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