Non-return valve

A non-return valve comprising:

• a valve body having an upstream end, an oppositely disposed downstream end, and a chamber between said upstream end and said downstream end, said valve body further having a lateral opening into said chamber;
• a flange portion extending from said valve body between said upstream end and one end of said chamber;
• a first valve member removably mounted to said flange portion of said valve body within said chamber, said first valve member having a guide rod extending in a direction toward said downstream end, said first valve member being mounted to said flange portion through said lateral opening;
• an obturator slidably disposed on said guide rod adjacent said first valve member, said obturator being mounted to said guide rod through said lateral opening;
• a second member removably mounted to said valve body within said chamber adjacent said downstream end, said second member being mounted to said valve body through said lateral opening;
• biasing means disposed between said obturator and said second member, said biasing means urging said obturator towards said first member, said biasing means being mounted between said obturator and said second member through said lateral opening;
• and
• closure means mounted to said valve body for closing said lateral opening of said valve body chamber whereby said first valve member, obturator, biasing means and second member are mounted in said chamber through said lateral opening such that said closure means provides access to said first valve member, obturator, biasing means and second member upon being dismounted from said lateral opening of said valve body.