a series is the name given by Radman to one of its full nozzle valves which have been designed for gas, steam, liquid and multi-phase fluid application, design criteria and application limits are in accordance with ASME Sec. VIII and ASME Sec. I standards, a series is divided into two categories: a1 series and a2 series.
a1 series: API 526 (ASME Sec. VIII)
a1 series has been designed in accordance with ASME Sec VIII and API 526 standard. It can be used for fluids in liquid, gaseous or multi-phase states, variety of types (conventional, balanced bellows and balanced piston) combined with the large choice of accessories and material makes it possible to meet any process and service condition in order to provide the best solution.
Features and Benefits
. Lighter and more compact construction:
Continuous design improvements have created smaller and lighter valves to support current industry design trends, especially space and weight saving.
. Interchangeable parts:
Valves can be modified from type to type, gas, liquid, conventional and bellows simply by changing only a few parts in a1 series.
. Simplified maintenance and service:
re-engineering has reduced the number of parts, making maintenance easier and more cost effective·
. Material Selection:
A wide range of materials are offered including non-ferrous for low temperature and oxygen service, as well as exotic alloys specifically for the chemical and process industries.
. High performance springs:
Safety relief valve springs are specially designed to guarantee set point repeatability.
Bellows back-up piston: in a1 series pressure safety relief valves, an optional auxiliary back-up piston for balanced bellows valves ensures fail-safe operation in the event of bellows failure.
. Guiding surface:
The material selection of guiding components together with a self-aligning disc and spindle pivot point, ensure correct alignment and no galling of guiding surfaces required by relevant codes.
. Seat leakage integrity:
Choice of nozzle and disc materials (coupled with superior lapping techniques) provides seat tightness to a higher standard than that required by relevant codes.
. Adjustable blowdown:
The valve reseating pressure (blowdown) can be simply adjusted to suit special or specific performance requirements.
. Nozzle design:
the method and location of attachment to the body avoids transmission of pipe stresses to the nozzle/disc mating surface.
. API 526 dimensions:
Standardized dimensions allows pipework layouts to be detailed confidently.