The Flowserve FlowTop control valve is a high-performance, general application valve coupled with the high-thrust FlowAct pneumatic diaphragm actuator. The modular design allows by using the same body with different types of bonnets, trims and actuators, the reduction of spare parts and offers an interchangeable valve for a broad range of industries and applications.

The FlowTop valve is capable of operating within temperature ranging from -200 up to +538°C (-328 up to +1000°F) according to the selected material.

Precise machined plug contours and long stroke lengths results in an excellent control performance. Easy upgrade from standard trims to low noise- or cavitation control trims. Up to 17 kvs/cv-values available per size, allows a wide range of process conditions for each size.

The FlowTop control valve offers a sturdy plug head guide for minimizing vibrations and wear.

Due to the design of a profile-ring – very reliable sealing between body and seat, easy maintenance, no machining required of the body seat area when changing the seat.

With the high quality, live loaded TA-Luft desig (PTFE or Graphite packing) we reach a leakage class
better than 10-8 mbarl / s

FlowTop meets the requirements of SIL 3/4

ANSI: 1/2” – 4” / Class 150 and 300
Materials: Carbon- and stainless steel, special materials
End connection: Flanged and butt weld
Leakage class: IV, IV-S1, IV-S2, V and VI
Options: Bellows seal-, Low- and high temperature extension bonnets, Low noise- and cavitation control trims, Live loaded packing systems, TA-Luft up to +400%B0C (752%B0F)
Electrical linear- and -rotary actuators

EN ISO 9001:2000
PED 97/23/EC Module B+D (EC type examination)
DVGW, EC Gas appliance directive 90/396/EEC
DIN EN 161, DIN 3394
TUV approvals for DIN EN 264, DIN 32725
TA-Luft (Clean Air Act)
ATEX 94/9/EX, Machinery directive 98/37/EC
DIN, EN, AD-Merkblatt 2000, ANSI, ASTM, ISA, CSA
EN 1349, EN 60534
NAMUR, VDI/VDE 3845 and 3847
AK 7 acc. to DIN V19250 / 19251
SIL acc. to IEC 61508 – SIL 3 (HDM) / SIL 4 (LDM)


  • Modular and compact design
  • High kvs- /cv- values
  • Standardized low noise- and cavitation control trims
  • Profile-ring sealing between body and seat
  • Direct mounted accessories (no piping required)
  • Direct mounted accessories (no piping required)
  • Short delivery times